Talk to Dermatologist on Severe Hairfall

Hairfall started in 2016 and hasn't stopped since. Got married in 2019. Hairfall stopped only during 7th-9th month of pregnancy and after baby turned 2 months old it started again. (Yes, I know it was postpartum this time but what about all the years before?). 21 months postpartum but still loosing clumps of hair. I've been to many doctors, all of my blood work came normal. No deficiency of vit D, iron, calcium etc. Thyroid and androgen test came normal too. But my hair fall doesn't stop. I've seborrheic dermatitis and my scalp hurts while I move my hair. Every doctor asks to do the same tests again even though I tell them that they came clear the last time. I can't afford prp. So please don't suggest that. Which other test should I get done? I loose so many strands every time I run my fingers through my hair. Even If I just keep them open they keep falling out. During pregnancy I took folic acid in first trimester and pregnovit, CMZ plus and iron one till the end. I still tak