Psoriasis or something else, I am confused

Hello Everyone
I am new to this website forum but find that there are lots of explanations etc. to everyones problems, so I think that I will get some help here.

I am 26 years male and the problem I have started(or I am noticing since) almost 8-9 years and has affected my scalp the most with lots of hair loss.

I see white, fine grains (powder kind of) like stuff all over my body which is not very obvious but in the ears it is much more everytime I clean my ear I find a thin layer of the same, otherwise it seems to be everywhere on the body with a little bit of itching below the knees during the winter period. I do not think it of much trouble to me and I can live on with it.

But the worst part is that it is on my scalp too and as a result great loss of hair. On hair first I used to treat it thinking as dandruff but it never helped and I kept on loosing hair. The symptoms which I observe is that the particle is stuck to the root of the hair and as a result it makes kind of patches of white flakes on my head. And during this period (when the patches of flakes are there) there will be too much loss of hair. But then I used to use shampoo like Nizral and then the flakes wont show up for next one month and then it will be again the same thing.

Secondly I dont apply any oil to my hair, But I find that my scalp will be oily on the third day of washing my hair, be it any shampoo. When I wash my hair with shampoo I see that on the third day my scalp seems to be oily and there will be more itching. Whenever I shampoo my hair lots of hair will come in my hand, it seems that there is no strength in the hairs. Even if I pass my hands through it hair will come in my hand. And currently as there is very less of hair then the patches of flakes are not formed any more but the flakes seem to be stuck at the roots of the hair.

I have been keeping perfect health since many years without any major issues except some cough and cold. Previously (till 2-3 years back)I used to have cough and cold too frequently but of late it does not happen that frequently. I eat much non-veg compared to vegatarian stuff. My grandfather suffered from Diabetes and my father has it(Diabetes) at a controlled level.

I consulted skin specialists in India and they said that it is not curable, so I consulted many homeopathy people also, but as now I am in USA I do not have contacts of any Homeopaths to continue the medication. I brought some homeopathy medicine from India and used them but during that time it was found that my body had too much Iron content and there was Iron deposit found on the lever and the doctors here suggested stopping the homeopathy medicine and with that the iron content problem also went away and so I did not try it again. But now my hairline is so thin that I want to cure it anyhow. Is there any cure for it and is there a way that the hair will grow back normally? I am sure that if my scalp stops oily secretion then the hair loss also should stop. Please suggest. Thanks for all your patience (in reading the above) and advice.

Neshat