As someone who has had all kinds of weird side effects/allergies/hives, it's very frustrating, because most of the time no one believes you. While I had no issues after my colonoscopy (I never was all the way out, just felt no pain and I actually watched it on the monitor) and came home and ate Indian food and rode my bike the next day, I have avoided other medical procedures because of this. I would strongly suspect there might be a preservative in the IV solution you had, in addition to the salt/sugar thing. I had a horrible reaction to IV contrast dye, even after I told the tech I didn't want it during a CT scan, because my mom was allergic to it and I am also allergic to most shellfish, which is pretty much the same thing (iodine).
NY, I would seriously try to find out what chemicals and preservatives were in all the medicines and "drinks" you took.