Hi all: I need to find a GI who has some imagination and a good intellect. I have a GI at U of M; he did a colonoscopy and all is well; i have had severe constipation for 25 years; for 20 of those years I have taken Magnesium; it works but it makes me feel awful; weak and sometimes dizzy. I have to take it; Itake 1500 mg of mag citrate pills daily although lately i do skip a day here and there; I discussed this issue with my doc at U of M but he had absolutely no new ideas; he doesn't really understand how bad this stuff makes me feel and in fact said it must be something else causing me to feel lousy; I have had blood work drawn and a recent physical; as far as I know things are ok; I am looking for options; perhaps some homeopathic option; i have no idea but i would love to get off magnesium for a little while to see how I feel. I just wonder if any of you who live in the Detroit, Ann Arbor area know of a really good gastroenterologist.