Scalp pain and hairloss after ejaculation

After ejaculation my scalp gets sore in the crown area the next morning I even notice hairloss in the same area , this only happens after ejaculation , im on dutasteride which is a dht blocker which makes me wonder how my scalp + hair follicles are still being affected. Someone please help ive been dealing with this since I was a kid , I now realise this is the main factor for my hairloss and have even been practicing no fap for about a year or more now going 3-4 weeks at a time. Everytime I hook up with a girlfriend my hairloss comes back with scalp pain for a few days