Desperately need your help/advice

Hello lovely people, I'm putting this message out there because I'm so frustrated and at the end of my tether with my skin and I need your help. I have have guttate psoriasis since I was about 5, I am now 21. It was triggered by a severe throat infection I got from a swimming baths and a few days later I was covered head to toe. As I was growing up my mum tried so many different methods. I was hospitalised and wrapped in coal tar bandages when I was younger and had light treatment on and off for years. When I was 16 I began medication to treat the psoriasis, I have tried Methotrexate, Ciclosporin and Acitretin over a number of years. It suppressed it for a while but the side effects were devastating - I struggled to walk my joints were so painful, the inside of my nose/soles of my feet peeled, my hair fell out. It's coming up to a year since I last came off my medication - my hair is starting to grow back and I am a lot less stressed due to finishing my degree, but my psoriasis is worse than ever. Nothing seems to trigger it - it worsens and gets better of its own accord. The itching is so bad & nothing moisturises my skin for more than a couple of hours. As you can understand as a 21 year old girl it's having a huge impact on my life - I can't wear what I like and it's even impacting the work I get (I work in the film industry). To add insult to injury my joints are also going through a particularly painful period again. So that's my situation. I would be extremely extremely grateful to hear your help and recommendations for managing and treating my skin - I'm in need of some hope as I currently feel like I'll never be rid of it. (Needless to say I have tried all the steroid creams/ointments prescribed by my GP - none of them work) Lou x