I understand, I've got pretty bad psiriosis and sometimes find it quite difficult to cope with. I'm nineteen, and a girl, and I hate not being able to wear what I want without worrying. I'm meant to be going on holiday with my friends this year, and I'm worried because I know I won't be able to wear a swimsuit. Lately it's been getting a lot worse, and my skin keeps cracking and bleeding - I know, sexy. I got quite a lot of grief for it in school, and I have to say it's knocked my confidence a lot.
I know psiriosis is different, but I thought I'd tell you some things that helped me:
1) Moisturise. All the time. Several times a day is best. E45 is good, and available on prescription: though I found that Dove Intensive Body Lotion works just as well and smells really nice. I really can't stress how important moisturising is. I didn't know to do this until i was about sixteen, and I think that if I'd known sooner it would have made a big difference.
2) Light treatment. See a doctor: it helps with quite a few skin conditions, though how effective it is depends on the person. I had it last year and it was wonderful - got rid of nearly all of it, though it's come back now. Do you find that your skin gets a bit better when you're out in the sun?
3) Seaweed baths/moisturising baths. I think you basically have to try and keep your skin as moisturised as possible. You can buy Oilatum bath oil in most chemists - give it a try and see if it helps.
4) I use steroid creams as well, but very rarely. I found that if I used it every day, it just made my skin get used to it and it would get even worse. I save it for particularly bad flare ups. Those creams are bad for you, used over a long period of time - they come with a lot of nasty side effects.
5) Diet - apparently citrusy fruit can make it worse. Not too sure, but I try to avoid it when my skin's particularly bad and i think it makes a difference.
Your doctor sounds like a jerk. They need to give you the basic knowledge and tools to deal with it yourself and make your life manageable. Hope some of this advice helps.