All I can say is you're
really lucky to have not fared much worse. About 20 years ago I hit a pothole at 37 mph on my bicycle. I went down, and slid along the pavement for a good 100 feet despite digging my sneakers down as hard as I could to slow down. When I got up I felt some wetness on my head. I wiped it away but was almost too scared to look. Thankfully it was only sweat. I consider myself very lucky to have gotten out of that with only road rash, a trashed front rim, and a ruined pair of pants. Escaping a motorcycle accident at nearly twice that speed with basically only a few bruises is something I would consider almost a miracle, especially given the way your body flipped. In my case, I just didn't fight the fall so as to avoid striking my head, and dropped down flat on the pavement sliding head first with my arms outstretched (another instinctive thing I do in a fall to keep my head from striking the pavement). Still, had there been glass on the road, I could have sustained very serious injuries. Oh, and I once had my bike up to 65 mph. Frighteningly quick for a small, unenclosed vehicle. I don't even want to think of the consequences of a fall at that speed. Anyway, it sounds to me like you got a second chance.
BTW, my worst fall in terms of injuries was when I was only going about 22 mph. I fell "wrong", and probably pulled a tendon or something in one of my legs (forgot which one). It took a good six months before walking on that leg felt normal again. For various reasons, including safety, my next bike will be a recumbent. By its nature you'll end up feet first in accidents, which is much better than head-first with a regular bike or a motorcycle. And since you're closer to the ground falls are less likely to injure.
Regarding Friday the 13th, yesterday I hit a good-sized pothole at 25 mph. I didn't go down, but my front tire went flat within two blocks. I guess the curse is for real.
As for lane splitting, I can think of a good reason to allow it. A motorcycle has no air filtration system for the rider, so sitting in stalled traffic subjects the rider to exhaust fumes directly from the vehicles in front. Riding between lanes lessen this a bit. The onus should be on the motorcyclist to avoid hitting any cars changing lanes while lane-splitting since in many cases the drivers can't see them.