Scalp Psoriosis caused by Regaine

Hello, When I was 16 I was bullied because I was starting to lose my hair so I went looking for something that would stop my hair loss. I used Regaine from boots pharmacy. I had a bad reaction to this product, It caused large scales to appear on my scalp. I stopped using it after I saw the irritation. I am now 32 and I still have this problem even though I stopped taking Regaine a very long time ago. I saw my Doctor about it a long time ago, he prescribed some shampoos that didn't work, he then recommended T-Gel shampoo which I still use now. It helps somewhat, I don't have scales that large but it's still a big problem, my scalp produces way too much skin and it causes me a lot of worry. It's itchy and uncomfortable. I so wish I could go back in time and undo what I did. Is there anything you could recommend? I feel like I really need to talk to someone about it, it's making me very unhappy. I'm also not 100% sure it is psoriasis or something else? Thank you Vincent