I am Pre-Op so I cannot relate completely to this, but that awful yucky feeling is familiar to me when my vitamins were off in the past- things like Vitamin D, Iron, the B vitamins. It's SO frustrating when doctors don't seem to be giving your results full attention. Have you considered an endocrinologist? In addition to water I'd say make sure you're getting a large amount of protein because that seems to be the quickest "fix" to post-surgery feelings from my friends who have had surgery. I think it would be good to see a mental health specialist, too. You've had MASSIVE changes to your life and even though they are generally good, any life change is a stressor in a way. I hope you feel better soon.