Help needed

[Duncan C]

Hi all, am so pleased to find somewhere I can get some support. My story briefly..........I have always had a tiny patch of scalp psoriasis which was annoying but no big deal. Around 2 years ago I lost my job in stressful circumstances and immediately (and for the first time) I had plaques appear on my lower legs. This was kept reasonably well in control via some steroid creams (prescribed) but in the last few months (and again stress related I think) the plaques have spread quickly and I now have much of my legs, arms and some of my back fairly covered in plaques. My GP had prescribed Dovobet which initially helped but then seemed to stop working and after a few weeks use I came off and was prescribed Dovobex as an alternative. This has proven to be difficult as although the original plaques have calmed and smoothed a little, I am still getting further spread of new plaques and I have intense periods where my legs and arms are incredibly itchy. I have been using the Dovobex for around 2 weeks so maybe a bit early to tell if effective. I guess my questions are as follows:

1. How long does the Dovobex typically take to work?
2. Is the spread of new plaques unrelated to the use of Dovobex / Dovobet?
3. Can anyone recommend how to calm the intense itchy hours I get?? 
4. Are there any tricks to control the spread of plaques to parts of my body that are unaffected?

I am very grateful for all offers of help.

Dunc