I had gastric bypass about 5 years ago...and this past year, I just have not been feeling like myself. One issue is I had been diagnosed with malnourishment, and a vitamin deficiency. So, we have combated those problem (with high protein intake, and a liquid vitamin that I can absorb), and now...I have problems with memory and tolerating the cold, so i currently take Vyvanse . I have also lost a substantial amount of my hair, and my neck seems to be larger than usual. My primary doctor had me to get a thyroid scan and blood test, and both appeared normal. I am still not satisfied with this diagnosis, because I still have symptoms that are not normal. is there any other testing that could eliminate or validate the thyroid as an issue? have you known there to be any association with irregular thyroid and gastric bypass?