I don't shower, but I am Queen of the Tub. I find what happens with me is that I'll end up having a nasty hot flash as soon as I'm out of the tub, because of the heat, and then I feel weak and clammy and awful until it passes.
It really makes me mad, because soaking in the tub is one of the things that makes my body feel better...so to have to go thru the massive sweating afterward just defeats the purpose...I feel all sticky and gross after the sweating.
It's probably the heat of the water affecting you - it raises the blood pressure, and then you get a sudden drop I think when you get out of the water, and that's what causes the weak feeling.
Make sure you have a grab bar, or something similar in your shower if at all possible...you want something sturdy to grab if you feel dizzy
DX: Fibro, Severe Myofascial Pain, Chronic Pelvic Pain, Surgical Adhesions, IBS, IC-PBS, Carpal Tunnel (both wrists), FAI, Reynauds, Opthalmic Migraines, Drug Related Hot Flashes, Physically Unable to Vomit due to Nissen Surgery, Extremely tiny and scarred veins (hard start for IV's)
Meds: Oxycontin, Tramacet, Cymbalta, Cesamet, Flexeril, Clonidine plus Vitamin D + Multi daily