I don't think this forum is very active. Rareshare alerted my email account that there was activity today because of your posting. I have never seen that before, if I have, it has been so long ago that I have forgotten. So that is why I'm here (the email alert.). This may be my first posting, so I hope it may be helpful to you.
First, large doses of vitamins can be harmful. Some types dramatically more so than others. Too much vitamin A can cause some of the symptoms you are trying to get rid of. Causality has not been established, but at least one study has shown that people who take multivitamins have shorter lifespans than those who do not.
Second, if your physician recommended bathing in diluted bleach or vinegar and that works for you, then stay the course. However, there is growing evidence and an increase in research that too much hygiene may be a bad thing for your immune system and can be a contributor to eczema. Getting the right kind of dirty may very well be beneficial. Just like the situation with vitamins, life is all about balances.
Third, I have a coworker who does not have Darier's, but was having trouble with something not healing up. His doctor recommended that he get checked for sleep apnea. He was diagnosed and prescribed a CPAP machine. He was not getting enough rest for his body to heal. I followed in his footsteps and now that I am on a CPAP, I have far less flair-ups from Darier's.
Hope that helps.