I too have hypothyroidism. I have taken Levoxyl for over 10 years. I had been started on Synthroid originally. Even taking my medication daily religiously I never did notice great improvements in energy levels. In fact, it had even spiraled downward instead. Weight has crept up over the years. Been consistently not feeling my best. The most bothersome side effect was the hair thinning. It happens when my levels fluctuate. Thankfully it is temporary and grows back. Only a month ago I started also taking Cytomel. I am finally noticing an improvement. Whew! I even lost several pounds without making conscious diet changes. Did you find out why your thyroid level was low? Are you scheduled to have your level checked again soon after beginning the levothyroxin? I was lax in being proactive about my thyroid treatment... I wouldn't like for anyone else to do so. Good-luck!