i empathise with you Retro. I have suffered with psoriasis since the age of 13. I have tried everything from steroid creams to UV treatment. By the age of 15 I had it all across my face, too. It has settled down in the last few years. Once my body becomes used to a treatment, it no longer works. I gave up using anything for years.
My psoriasis is finally under control. Holidays are great for me, whether it be the sunshine or relaxation, or a combo of both, I'm yet to find out. I am using dovobet, sparingly, and soak in bath salts. Pure aloe vera seems to work a treat too. I am sensitive to a lot of washing powders, foods, pets etc so I take anti-histamines regularly, but couldn't say if this related to psoriasis.
I've also calmed down a lot, and cut my working hours (although I still work a lot compared to most, 50+ hours) I used to be on the go, go, go.
At work, I've trained a few people to take on some of my responsibilities, meaning I can crawl into work an hour later every now and then, and even enjoy days off without worry. Delegation is not so much a problem as trusting people to do a job. Train well, they will not fail. We are all dispensable to any company, so think of number one, do whats right for you, Retro.