I had something similar happen... My injury was in february, and this summer, things were going very well... I had headaches, but it wasn't horrible, usually very manageable. WE went away to visit family, and while there, I tripped in a darkened theater. I basically erased about 3 months of recovery in one fell swoop. We had another vacation planned (late honeymoon actually), and I managed to make it through, but only by ramping up my headache med usage and sleeping several times a day.

One of my best friends then layed into me for not visiting her and her new baby... which would mean another vacation... she said that because I had been away that I no longer had any "excuses" for not coming... I wasn't thrilled with her, and landed up writing a very frank email letting her know how hard it is to have an injury that no one can see, and that her insinuating that I was now just using my injury as an excuse was hurtful... she emailed back immediately letting me know that it came off wrong, and that she was sorry...

I am now much improved, but still not where I was this summer. It's frustrating, and has led to me delaying my Masters till January instead of starting in September.... but I feel better knowing that I am taking the time I really need to heal... But I am fortunate in that I am not working, and will not be cleared to go back to work until january...

Take the time you need to heal.. If you need to get sick days, get a doctor's note... HEre in Canada we have employment insurance which will cover up to 16 weeks of sick leave at 60%... it's not great, but it IS better than nothing!