<s>[INST] I have had diarrhea for 6 weeks, Severe migraines, and now for the past two days whenever I stand up I get real dizzy and shaky and fall down. Had a CBC with differential and Extensive Metabolic blood test and everything was normal including my electrolytes. What could be wrong? [/INST] Hi,thanks for query.Diarrhea since 6 weeks really needs some more investigation if routine investigation are normal.It is obvious that due to prolonged diarrhea you will have weakness due to poor oral intake,more loos of fluids.The problem that you have could be because of this.Please talk to your doctor and get diagnosed and treated,in mean time drink more liquids like fruit juice,re hydration solution ,take light diet and also take proper rest.bye. </s>