Problm after saw palmetto. Impotent?

Hi, I'm 25 yrs male, I have taken saw palmetto with beta sitosterol ( 500 mg ) for one month because I had hair loss problm in the month of May - June ( for one month daily one capsule ), after that I'm facing lots of problem, *erectile dysfunction, *libido problem, feeling like an impotent, *I became too much weak, *sometimes muscles are paining , *I lost my weight and muscles I had before, *sometimes getting pain in testicles , *during urination time getting pain in left side of penis, *I can't feel the pressure of urine, previously it never happened, Is it due to less testosterone ? I don't know to whom I should consult ? Previously I didn't have any problem, now all this problem I'm facing, it's near to 8 months, what to do ? Am I became permanent impotent? Plz suggest me.. Thank you ..