Hair fall after first session of prp

Shock loss is rare after plain  PRP. In fact, shedding should decrease. Allow a couple of weeks to see results. The combination of PRP and finasteride should perform well for male pattern hair loss.  If not, a reevaluation of your diagnosis may be needed.
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It takes time for PRP starts working. On average, from 3 to 6 months when you potentially can start seen results. Swelling in your head is normal phenomena, it should subside in few days . Continue using Minoxidil but slowly start weaning yourself off , gradually. Start taking supplements , I ALWAYS suggest LIFEPAK® NANO +TEGREEN 97® from Pharmanex. It works ABSOLUTELY great . Be patient and wait on PRP results. In 6 months , if you do not have any improvement , than contact you provider or find hair loss specialist advise  you on the  best treatment options available  tailored to your case. Based on my experience, injecting just PRP is not enough . In my clinic , we inject PRP+Stem Cells+Vitamin Cocktail+Microneedling  with PRP boost 6 months after initial treatment taking into consideration the fact that patients are good candidates for the treatment and they are taking supplements and green tea for at least 9 months. 

Prp itself shouldn't cause shedding. Some swelling is normal and should resolve in a few days. PRP should be combined with progesterone for the best results. It takes 6-12 months of treatments to start to see the best outcomes. I suggest seeing a hair loss expert to evaluate and go over your condition and provide you information about your best treatment options. Best, Dr. Emer

One treatment is not enough to gauge whether it is successful or not. I recommend 4 treatments, on a once per month regimen. Most patients see their initial growth between the 2nd and 3rd treatment.