Hi all long time no see, I have a major problem that I need advice on

My only friend in London has got tickets tonight to a rock concert and he wants me to go, I hate crowds for one and for 2 if anyone touches me I switch, herein lies the problem, about 3 months ago my best friends mom died, I went to the funeral and then onto the reception all the while avoiding physical contact with everybody,

Has the evening progressed my friend got blind drunk and picked a fight with me, I am not proud of what I did next, I beat him up in front of his whole family and stormed out the building, I still to this day refuse to apologise to him, he was wrong and he knows it, anyway he has categorically said if I don’t go to the concert tonight then not to bother calling him again.

I really am stuck on this, what if I go and switch and beat him up again for putting this pressure on me, pressure I really don’t need at the moment has I am not currently on any meds has they are getting switched around, again, and on the other hand I don’t want to lose his friendship, he knows I am DID and all that that entails, I told him he is being unreasonable and has put me in a no win situation, so what should I do?