Good luck on the PRP. I have had THREE...yes, THREE PRP procedures ! The one thing I can tell you about PRP is youhave to remember that what it is doing, is essentially healing that area and adding more scar tissue.
Muscles, tendons, ligaments, etc...they all repair from compounding scar tissue. Not like a bone that breaks and is then healed back to normal, which is why when we hear athletes break something, they are back on the field quicker than a torn ACL or MCL.
The reason why the second time hurt so much, could have been due to the lack of lidocaine injected into your area as some doctors feel the second , third and so on, treaments can be hindered with lidocaine and almost "water down," so to speak the good platelets that are used. I know, those needles suck ! They are usually 5-7' long and bendable, so they can get around the tendons and other areas they need to by pass, so even if you are a little numb, you feel every little twing and twang of the muscle, ligament or tendon hit. It sucks ! The good thing is that they find the area by using that ultra sound and can pretty much pinpoint it to where they want the blood platelets to go. Provided they also have a very good MRI to review as well.
One STRONG bit of advice. After your last PRP, lets say a month goes by and you start to feel better. Please DO NOT, thing you are healed! I had my last injection and about two months after, didnt feel the pain, slipped on the ice as mine was my knee and it twisted and I was back to square one. Make sure you get some very, very light rehab.
Hopefully they do a fat graph of some sort. I have read where some people with cartilage issues have actually had bone marrow aspiration or (BMAC) taken from their hip and then had the same type of procedure with the PRP together. They put in the bone marrow/cartilage, to the affected area and then add the PRP on top as sort of a [Miracle Grow] fertilizer of sort to help it grow. Maybe bring this up to your doctor and see what he/she suggests. Unfortunately PRP is good for minor issues but it sounds like you ripped the heck out of your shoulder, so although it may heal, it is going to take some time !
I joked with my doctor and asked if I added dome Deca would that help, he didnt hestitate to tell me, off the record, that yes, it would help.I was surpirsed to hear him tell me that and then proceeded to ask for a prescription, which he laughed at me and said, no way.
Not sure if that would work for you as Im not familiar with the affects Deca has on women but nonetheless...if you do use anything, maybe something similar may help.
Lastly, again, the only thing I can strongly tell you is please, please, please dont think that just because you feel better in three months that you are healed ! It is scar tissue and you need a lot of it to cover that type of injury. So, see what he/she has to say, ask them what kind of re-hab they suggest and give yourself a solid year to rehab that area. I know it sucks and sounds like a long time, but I am going on 5 years of Synvisc injections, PRP, surgeries, constant rehab, etc. and mainly the last three were because I pushed it to fast !
Good luck and PM me if you want any side info, as I am very familiar with PRP and other procedures.