what to do if I suspect to have permanent side effects

I took Propecia for 4 days, I felt well for 8 and since then I have been experiencing testicular pain, penis shrinkage, loss of erections. I’ve had these symptoms for the past 2 days.

My question is: what and when should I do now? Wait to see what happens? Take a blood work (I have one from my pre-propecia time to compare with)? Consult a doctor? Which doctor?

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