I a ru n y gastric exclusion in 1969. At first I did well, but like you I have had many issues. Teeth is a major issue most of my teeth are capped or I have had implants. I have had major blood issues with low hemo twice so far. I take vitamin B12 shots once a month, that seems to help. I have had iron infusions for 6 months at a time, as the hemo goes down to 6. I eat fine I don't have dumping but I algree mitamins don't work. I don't sleep well either, the most I sleep is around two hours at a time. I use to get charlie horses at night, but I have started taking Mag.Calcium and Zinc. that seems to help but now I get kidney stones more frequently. My legs ache and I wish I could walk more but because they ache I talk myself out of it. I don't think there is anything you can do about it. I guess you just traded one problem for another. I have a few memory issues, but I am in my early 60's. I just assume that I have a lot on my mind. At least that is what I hope it is. Maybe not, but I know it is annoying when I can't retrieve what I want to remember at the right time.