Man, I was on the same path as you I can say. I know what it feels like. My inner game crashed when I lost my friends for a reason I do not know. I felt like shit and my self esteem was at an all time low. Before that I was the man everyone wanted to be around me and I had very high self esteem. Even though I wasnt very good at picking up women I was great at talking to women and women even told me that im really "smooth". Also, I too am going to a news school and it was a bumpy fucking ride at the beggining but once I decided to do something about it everything got all the better.
I started to make friends and started chilling with people. It felt real good. Just warning you do not go into a stage where you dont talk to people. Ive been there before and when I made the decision to start talking to people and that I didnt like to spend my weekends home alone shit started clicking. For you your in an uncomfortable situation where you have to meet people if you want to have friends. Obviously your fucking good with women you just need to do what will make you happy even though at first you might not like it. The twitching problem is something I had. It came up for me when I was usually really anxious.
Now, with all the work I did on my inner game its simply gone. Your game is weak because you are not pleased with yourself and where you are right now. Get back to where you were in high school. Start interacting with people and just force yourself out of this slump with action. No matter how uncomfortable or fucking pointless its gonna seem youll get out of it. I was there too. I felt helpless and thought this was how I was gonna end up living my life. It all changed and it keeps on getting better and better. As to how I got back up. I forced myself to start talkiing to people. This seems like shit advice but this is what i did. Then, I started working out alot and went through a couple trainers. I conversed with them alot and seeing them liking me gave me more of a liking of myself. In other words it raised my self esteem up and gave me a little more confidence.
Then my journey on this whole self improvement thing began. I started with the Power of now by Eckhart Tolle and went onto the sedona method. Shit got alot better from their but that want it. I was also taking action approaching and conversing with girls and that upped my inner game too. Then after a long break from this self development inner game stuff I got back in. Read wayne dyers pulling your own strings,Napoleon hills think and grow rich,David deangelos deep inner game, Hypnoticas ultimate inner game, psycho cybernetics, psychology of achievement, man transformation, and now im on RSD the blueprint decoded. Not gonna lie but I didnt finish all of the books but read about 3/4 of some of them.
ITs a matter of staying commited to one program or book thats hard to do for to do. My inner game has improved alot. Id suggest you start with David Deangelos Deep inner game to find out where these problems are coming from then move on to all the other shit I listed. If you need more resources I can help you out if moneys a problem I can help you out too

I know what you are going through it sucks but once you commit to improving yourself and stay commited your gonna go back to the you who was fucking chicks in class

You got this man
PM me I can help you out with all this "inner game" material if moneys a problem.
Peace dude