I'm 28 year old, single, physically fit guy I usually do masterbating when I sexualy exited weekly 4 or 5 times since 7 years , few days ago I started using kera xl hair growth serum for hair loss treatment. Meanwhile I suffered with gastric and loose motion but it stopped, since that day onwards I have problem with ejaculation feeling little pain and not that much excitement , I thought it may be side of effect of hair growth serum and stopped using that despite it don't have sexual any side effects as suggested my doctor uncle . But still my problem persist. I'm shy to consult sexologist. Urine passing is normal. What would be the problem.? Please help me out