Hi, I have NMS (NCS they keep changing what they call it) I have feelings of an adrenaline surge and them, a sudden overall weakness, and if I am not smart enough to lay down, I will faint. (As the people at Walmart, the grocery store, the hospital ER at the sight of blood, etc, etc can attest too) My mother had colon cancer which prompted early colonoscopies for me. Every time the prep has had extreme bad effects, rapid heart rate, very high BP, fainting, etc. the last time was the worst and scared me enough that I have delayed the next one. Which is 2 years over due. My Dr. retired and now I have a new one who seems to brush this off, but is giving me a new prep that he feels is less taxing and much less volume. Have any of you had similar problems with this test? And what did you do about it? Thanks for your input!!