I only had one shot, and my hair started coming out in clumps and breaking off as well. It's been coming out so fast that someone at work recently, in an attempt to be helpful, told be about a great place to buy wigs.
I canceled my next shot too. When I decided to take it, I didn't really know what I was doing. I had just been diagnosed, and didn't know much about osteoporosis. Joining this forum has been very educational for me. I won't start any other treatments before learning all that I can. The book frequently mentioned in various threads, Great Bones by R. Keith McCormick, DC is also helping me to better understand the benefits and risks of the various osteoporosis treatments that are available.

There are shampoos that are supposed to stimilate hair growth. I don't know long Prolia stays in my system, so it may get worse before it gets better. From what I've read though, it is possible to grow it back, but it takes a while.

I hope we both find better treatment options, and can regrow our hair.