Welcome Mimi,
Nice to meet you. I'm Kelly and a PCS sufferer as well. You'll meet awesome ppl here who are very knowledgeable and give great advice. Sorry for what you've had to endure it's hard to find healing when others aren't supporting or understanding.
You will find that here at least. I don't know much about sub concussive hits but I am learning about PCS and my restrictions and had to on many times have to demand a listening ear to WC & Employer. Which is weird to me coz my employer is an Registered Nurse. But anyway, if you have any questions we'll all do our best to help!
My best to you