Second try here-- I was posting a reply when something knocked me off line.

Kirsten, just read your post a few minutes ago. What you are describing is so similar to what I went through a few yrs back. I was lucky to never demolish myself on the floor if I passed out, I did get hurt some but not like you. I also had people around most of the time. I remember the pain you describe, I remember laying in bed praying to pass out to get some relief...if I was lucky the pain would subside when I would wake up but often it was still going on...
The helmet-- won't lie to you, it sucks big time but it beats knocking your brains out and suffering bouts of brain injuries. I had to wear one for 15 mos 23 yrs ago , until the doctors could clear up an issue I had. They aren't like football helmets, more like boxers bands. Soft and padded but still a pain until you decide to forget it. I remember the first time I had to answer the door, almost didn't but then made up my mind that I didn't care.... and guess what, most of the time I got no reaction, more people than we imagine have to wear them. Friends and relatives didn't bat an eyelash because they were relieved to see me with protection. You just pretend it's a riding helmet...yes, I still rode but never without a helmet.
Please take everyone's advice and follow through on this, and please protect your head, you won't be sorry. And the medic alerts as mentioned are for anyone here also. The hospitals don't charge very much and they are well worth it. If you don't check in every night and every morning when you wake they call you...if they get no response they send help. Please do take care of yourself, I'm also a huge fan of your photography.