Excessive hairfall. Dyed my hair.

I am experiencing excessive hairfall since last 1-2yrs. Have tried homeopathy, allopathy, home-made onion oil and what not, but nothing is working for me. And now I am here on Practo hoping that I will get a solution to my problem here maybe. My hair volume has reduced to just half of what is used to be 2 years ago and the texture of my hair has also changed from smooth to super frizzy. I wasn't having any history of dandruff before but it has gradually developed with this hairfall problem. I feel like the hairfall tends to increase whenever there's sweating on the scalp. I am not on any type of medication+there's no sudden change in my diet patterns and I haven't even switched cities. I have never had any hair treatment and haven't dyed my hair.