I have been off of fin for about 7 days and I’m scared of PFS. I have been taking Propecia for 9 months. How common is this that guys can get permanent side effects?

Do you now have sexual side effects? If you have made the decision to stop the finasteride, then it is highly unlikely (statistically) that you will get PFS. Your sex drive should come back after a month or possibly two. Don’t talk yourself into a problem as the placebo effect is real