Hair thinning. Please suggest!

Had full thick hair before. (age:21 first half)Started with itching and burning scalp when I used to do work out at gym. After few days I saw there was a drastic change in my weight..lost almost 10 kgs in 1 month. Whenever I used to comb, I could see some dry flakes coming out. This(dandruff) still happens on and off. (age:21 second half) burning stopped. Met one homeopathy doctor and took some medicines and was diagnosed with some normal hair loss. It never helped. (age:22first half) met a dermatologist and got diagnosed with MPB. He gave a lotion with some medicines. It never helped but instead made my hair look worse..got some pimples on scalp. (age:22 second half)met a family doctor. Was asked to do some blood test. VitD-8.1,vitB12-122,low iron. I was given some injections for it and it got recovered. Hair loss stopped and is still maintained. (age: 23 first half) met a dermatologist, was diagnosed with CTE. Gave some vit tablets and tugain to apply. No improvement. Please suggest