Hair loss and oily scalp

I made a post about this w not much response.
I have had a problem with an really oily scalp, I have to wash it couple times per day or else it becomes oily very quickly.
I have had hair loss for years (oily scalp too).
It started when I had dandruff when I had a full set of hair.

I have heard about oil pulling, using vinegar and other things but I need some clearing up about this, Im very confused about how to deal with this?

And what causes it?
So I can prevent it from getting worst.