Sad to hear Jon. Hope you feel better in a few days. I know from personal experience that it takes at least a few days for the head to get better. (Hubby had a go around with some punks, he won but was still beaten pretty severlly in the head).
If you can't go for criminal then first advertise (TV stations eat this up) look for witnesses and if all else fails, take it to Judge Judy. She seems to see thru these guys pretty well and maybe you can get some monies back.
Lotsa water and juice tho! Seems to help with head trauma.