Scalp Psoriasis-I've tried everything, what should I do?

hey everyone, I developed scalp psoriasis about 2 1/2 years ago. it was terrible, and i lost half my hair. I don't scratch it, but i find it very hard to resist the urge to pull at the plaques, especially when it builds up and will hurt so much that i cant lay my head down without pain. Initially I did a bunch of steroid treatments recommended to me by my dermatologist, such as ketoconazole shampoo, and t/sal, among other things. It worked for about a year before it started coming back. I then found out about Dr. Pagano's diet, and its pretty similar to what other people have mentioned. Basically, you stay away from: red meat, sugar, gluten(white flour specifically), peanuts, nightshades, and alcohol, just to name the big ones. I honestly would recommend buying his book if your interested and really really, follow it to the letter. Within 4 months my plaques where almost completely gone, I could move my hair freely, and pull it into any type of pony which was such a blessing. Now, its been over a year since I did the diet, and the problem for me was that I developed eczema as well midway through the year, and I was told to go on another diet by a private nutritionist. The combined diets got really difficult for me, and I ended up cheating slightly on my psoriasis diet. I had also stopped doing treatments because I thought it was gone. 2 months ago it came back, and worse than before. I've basically pulled out half my hair. I'm restarting the diet, and praying that it works. I honestly just want to shave all my hair off at this point, its gotten so painful. I cant do any biologics because I'm to young, and I'm concerned about the side affects. But if this diet doesn't work, I don't know what I'm supposed to do. I try to stick with natural stuff, for health reasons, but does anyone have any recommendations? Does shaving really help? Is there any other things to try?