Effects after taking one pill

Hey guys,
I have been suffering from hair shedding for the last year, so I recently went to my dermatologist who gave me a prescription to Propecia.

I took one pill, about a week ago, and a couple of hours later I experienced numbness in my testicles (never happened to me before). I stopped taking the pill, however, in the last week or so I am having a serious trouble of attaining an erection.
Even in the morning, I have had the “morning wood” which isn’t apparent anymore.

I am extremely worried about this. Could this be possible that I am having erectile problems even though I only took one pill of 1mg?
I also feel extremely nausious and tired ever since I took it.

How long will these effects last? Is this permanent?

Thank you very much for your help.

Many get better in 60 days. So give it 60 days or so. Take care of your self as best as possibe and hope for the best.