Should healthy looking shed hair grow back?

I wouldn't describe my hairloss as being particularly aggressive, my hairline receded about 6 years ago and hasn't advanced any more since that period. In January, I started shedding hair, most noticeably from hair hairline, were if I towel dried my hair i'd have loose strands on the towel. I could pull on my fringe at any point and have atleast one or two hairs come out. I started propecia and the shedding increased initially, but seems to have slowed down now but my fringe feels like it's lost a noticeable amount of density, like it gets wrecked by a light breeze now

My understanding of sheddings role in hair loss, is that it's normal to shed hair, however if you're predisposed to mpb then the hair will continue to grow back thinner and thinner until it's velus or can't penetrate the scalp. Feels like my hair is literally falling out at an alarming rate, could I expect the hair to regrow or did the follicle die or something?

Second question, i'm just over a month into propecia and until now didn't have any problems. My libido is the same but my erections are weaker, can this be a phase or should I just get off of it? I briefly had watery semen at the start but it returned to normal after about a week, should I try riding this out?

Thanks for reading