I believe that you are too close to your injury date for a PCS diagnosis. That only comes when your symptoms persist.

You have, however, as evidenced by the gash on your head, suffered a TBI. TBI's with loss of consciousness are, generally, more serious. Whether you blacked out from the clunk to your head, or from some other event that precipitated your collapse, remains an open - and critical - question. Did you trip or did you faint?

Have you had an EEG to rule out a seizure? Has your blood sugar been checked? Were you on any medication, especially something that might have reacted with the alcohol?

You do really need to know why you collapsed. What if your next "data point" occurs while you're driving?

As for TBI/PCS keep a journal of any symptoms. Also talk to those close to you about your behaviour, etc... TBI patients are not always aware of their own condition. Many think they're perfectly fine , despite massive empirical evidence to the contrary.