I think we're different. If I force myself to shower when I don't feel well I make it as minimalistic as possible. Just shower. Add shampoo and soap. Rinse. Done. No frills. For me that worked better than trying to mask showering as a pleasant experience, then I'd just feel bad because I still feared and hated it.

Also when I'm really unwell I do NOT shower. I only wash out my hair with clothes on. Separately wash pits and change clothes. I don't care if people say it is disgusting. It makes me cleaner and I don' have to suffer through the torture of nakedness and water.