are you pretty certain it is water-related then? Like if you avoid water you wouldn’t have these problems?
Well the less water contact I have the less my outside skin itches and from inside skin the less I have heartburn/reflux/GERD and pee frequency, that's 100% certain.
But it's quite a bit more complicated. It gets worse from things in the water, like soap, shampoo, chlorine. If I soap or let shampoo run over my whole body esp. face for a few seconds, that area may itch for 20-30 minutes, if longer for hours.
My outside skin is sensitive to quite a few things other than water, like synthetic textiles, incl. 2% lycra in socks too, sometimes even organic cotton is treated in a way that causes issues, not itchy though, makes me feel strong discomfort, sweaty, get fungi quick and more. Creaming it often makes it worse, even with organic stuff, altho that's better. This year I was more oversensitive to insect bites too, many grew and caused sleep problems until essential oils and/or cold showering helped.
And my inside skins are my 100s of food and drink intolerances, GI and bladder problems. Again it's avoidance of the triggers that gets all GI and some bladder symptoms under control.
Both my outside and inside skins are very sensitive to meds, so I often get enormous rashes, GERD or IBS-D. (Most supps are OK, but I need to be very careful with everything acidic: ascorbate instead of ascorbic acid, and encapsulating that and amino acids, which others can take without problems.)
that’s a detailed regimen you have to follow
Yup, my high quality of life and happiness is only possible thru an extremely detailed regimen. Before fibro I only had to think about my skins, back and nerves and could allow being a bit lax. With fibro and the jabs I only have a chance with "zero tolerance" to anything like these I can influence, cos there's enough I can't and the laxer the more build-up.