Report Vasoconstriction Or Vasodilate? in Dysautonomia Discussion Posted January 26, 2016 Good question. I have been wondering about this too because I seem to have problems with both. Katybug I can relate to being ice cold and not being able to warm up. And then if i shower to get warm, i will suddenly cross the threshhold and become too warm, nauseous, etc. So maybe its more that the control in general is poor, whether needing to dilate or constrict?