I also feel drained after socialising. Usually all night my mind will be focussed on swallowing because I'm terrified I'm going to choke, fixing my mind on swallowing is like a way of controlling myself and I daren't let go.
I always think the worst may happen and I may choke loudly so I suppress all my actions, I don't dance or if I do it's only for like one song, if I become aware of the urge to swallow I find it hard to think about anything else and have to leave the dancefloor, I don't want people to notice me fixated on swallowing all the time.
I don't speak as much as I'd like to cos I think 'if I strike up a friendship with this person and then choke, I'll have lost a friend so it's better to say little'.
By the time I get home my throat is sore but I think 'phew, nothing bad happened, I didn't choke' even if someone offered me £1,000 I wouldn't relive that night again.
But to answer the question, yes, I feel very alone after socialising, it's so true that after a day of chatty briefly to strangers, being pushed up against people on the bus, hearing fascinating conversations, queuing up for lunch, speaking to a careers advisor/driving instructor/tutor etc when you go home all of a sudden you feel lonely.