Dandruff Home Remidies or shampoos that work.

Abby
Hi! 
I need your help!!! 
I have really bad dandruff. I never used to have it until about a year ago and it just started to get really bad. My scalp is really try & itchy and of coarse when I itch, I have flakes (which is annoying and gross). Now that works get is coming soon, it's going to get even worse. Is there any home remidies you've tried and know work or even shampoos that work! 
The shampoos I've tried are, Head & Shoulders, Sulsun Blue & moisturizing shampoos from different well known brands like Treseme and Futuis. I have oily hair as well and I wash my hair every other day. Please help!!!!