It makes me really angry when I hear that the gp's aren't interested. Squoosh is right, it's a serious disorder that causes all kinds of problems including mental health.
When dd had guttate (a form that comes as 1 - 2cm wide bright red spots angry strewn across the body. Intensely painful and itchy) the Gp just read about it on the Internet during the consultation. She said it work go away as it happens after a sore throat (not necessarily true). I knew it wouldn't as I've the same sort throughout periods of my life. I just made a nuisance of myself. I kept going back every 2 weeks. Eventually I saw a different Gp who saw what agony dd was in (and how severe the psoriasis now was). She fast tracked us to a dermatology nurse....who sent us to the senior derm at the hospital...who within about 2 mins fast tracked us to uv light treatment.
The hospital uv treatment is serious stuff. It's like a Tardis room of uv tubes, completely enclosed. You stand naked and get blasted by certain uv rays. Dd went 3 x a week for 12 weeks. It was built up from 30 secs exposure at the start to 2 mind at the end. You could clearly see it working about 8 weeks in.
Some suffers say they use their own uv lamps but I'm not sure I would consider this. It's very very easy to do yourself damage. The hospital were ultra careful with dd, checking up on her skin in between visits by phone. There should be a properly programmed usage and build up. I just wouldn't trust myself to do this properly. They are not your normal uv tanning tubes....they are very expensive.
You need to get a referral for uv. Keep going back to the Gp until they listen or at least send you to the derm nurse. I found the derm nurses SO knowledgable and helpful. I learnt a huge amount about applying moisturiser properly (which I believe is why dd is still clear now). They also make you fill in a mental well being questionnaire every visit.
There are plenty of things out there that will help - its just a case of finding 'your' thing. For instance, I know someone who gets relief from scalp psoriasis from Baking Soda and vinegar! I also know people who take Fish Oil tablets religiously.
I really recommend having a good look at www.psorasis-association.org.uk
They are the foremost, up to date place for information and support. Invaluable. They are my chosen charity
Sorry, this post is soooooo long.