There are a lot of horror stories regarding thyroid problems and mis-, under-, and over-medication. When un- or under-medicated, weight is a huge issue for a lot of us. My mother had a complete thyroidectomy when she was young and they put her on Armour because that's all there was. She maintained her weight just fine for many years. Then when $ynthroid the "wonder drug" came out they switched her onto it and from then on her weight spiraled out of control to the point where she was in the hospital on a measured and weighed 1000 calorie a day diet, was only eating about half of it, and was gaining a pound every single day. She had to have an intestinal bypass.

I went undiagnosed for 20 years because doctors misinterpreted blood test results. In the first place my TSH levels were moderately elevated, and in the second place, TSH levels are really a measure of pituitary function, not thyroid function, and when someone has multiple symptoms of thyroid disorder (as I did) with inconclusive or even nominally "normal" TSH levels (and a family history to boot), there are other tests that should have been run and were not. I have some form of weird tertiary (its not even secondary) hypothyroid disorder that was never going to show up as a strong positive on a TSH test (though I had several weak positives which doctors were ignoring because they thought it wasn't out of range ENOUGH).

I have been on Armour thyroid for about 10 years now and when I can get it (sometimes I can't because of my financial situation and lack of insurance and access to doctors) it regulates my condition very well, but it took almost a year for things to stabilize.

Even if you need Armour as opposed to Synthroid (I do because I need both T3 and T4 because of binding issues and failures in the conversion process) you will not lose weight on it by magic. Without the Armour I gain weight uncontrollably: unless I literally go on a starvation diet I WILL gain weight.

On the proper, stabilized dosage, the weight gain stops, but I have to work harder than "normal" people to lose the weight. Figure I was running (not jogging) 2.5 miles a day and eating 1200 calories a day just to maintain at 20 pounds overweight when I was younger (and unmedicated); now if I bike 250 to 300 miles per week I can maintain at "just" 60 lbs overweight on stabilized meds. Without the meds my weight will shoot up to 100 lbs overweight on the same diet and the same level of exercise. So being properly medicated doesn't mean you'll start losing weight spontaneously, but you should stop unwarranted weight gain (by that I mean you're not downing a gallon of Mountain Dew and a family size bag of chips just for a snack) and weight loss becomes at least possible, if still difficult.

There are some people that Synthroid just won't work for, and we usually have a devil of a time finding that out because doctors have been brainwashed into thinking man-made is better than natural. Well sometimes it is better for a few people, and it's "as good" or "good enough" for a bunch more, but it doesn't work for everybody. Same is true of Armour; it doesn't work for everybody. The original poster indicated some heart problems, and that's a prime reason NOT to give Armour because of the effect too much T3 can have on heart function (though too much T4 can do the same thing for people who's T4 to T3 conversion processes are working properly).

Sometimes the doctors will "trial" us on synthroid for 6 to 8 weeks, and if there isn't immediate improvement they don't consider that possibly it's the wrong medication, the wrong dosage, or both, they'll just tell you you're imagining things. It's backwards thinking: short term treatment with this med didn't work therefore you're not sick, as opposed to this med wasn't appropriate for you, let's try an alternative treatment. Also people who are long-term untreated as I was take a lot longer to stabilize because there is so much more wrong by that point than just your thyroid hormone levels (I flunked an adrenal stimulation test and had to take a small dose of cortisol, gradually tapered off over a 3 year period).

People with Hashimoto's syndrome (google it if you're curious) have a hard time stabilizing on ANY form of thyroid meds. And Hashi's is rarely tested for unless the patient finds out about it and asks for the proper tests (patient better know what the proper tests are too because most docs don't)

So yes, there are "horror stories" out there for people who are put on synthetic thyroid hormone when it isn't appropriate for them. If you can't metabolize the drug; if you have absorption issues related to fillers; if you have binding problems or conversion problems; or if you have any other problem specifically related to levels of T3, the synthetic version isn't going to help you, no matter how thoroughly convinced people are that it's the "same thing only better". It isn't the same thing, and it isn't "better". It's just different.

Can you guess that's a sore topic for me? LOL! I SUFFERED for over 20 years while doctors told me there was nothing wrong with me when there clearly was (I spent 12 years of that AVOIDING doctors because I was tired of being blamed for my health problems). Still tingles a bit. LOL!