Hair thinning throughout the scalp including sides. Also suffering of white dandruff like flakes all over scalp.

27M. My hairs are thinning all over my scalp for last 2 years. Using topical fin + min for last year and no improvement. Also taking tablets for vit d and b12.

When I shampoo my hair it gets super oily very soon.

Today I oiled my hair with MCT oil and it looks way worse specially left side. I also lost like 20-30hairs while oiling.

Even when my hair is dry it has lot of dandruff like flakes that I cannot get rid of.

Can someone help me identify what could be the issue and how to fix it.