I remember speaking to you before last year and remember some of your family circumstances, also that you were worried you were not fitting some sort of social norm by not having a relationship and also that employment prospects were not all you wanted. As I mentioned it reminded me of my anxiety thoughts (about slightly differing matters) which always came up with the worst alternatives.
You have had difficulties, coming from a heavily religious community, and early onset diagnoses of mental ill health, together with an unfortunate toxic first serious relationship.
May I ask if you graduated, you did talk of final year burnout at one stage?
Despite these barriers you have a job, one good enough to allow you a measure of independence. This is very natural, part of a person's adult development.
Moving out by yourself is a pretty big step, as is a new job, both taken together will give anybody concerns, and with a history of anxiety it is not a surprise you are reacting. No familiar faces around for a start.
Add to that the lockdowns and it makes for a difficult time, particularly after having read that idea of bringing on paranoia.
Your withdrawal is not deliberate, it is circumstances, your anxiety has latched on to a great fear you had before, and your sleep pattern is one you had trouble with before too.
In short no you are not 'losing your mind' or having an 'episode'. It is anxiety kicking in, very unpleasant (as I know very well) but that's it.
So can I ask if you are under treatment for your anxiety at the moment? If not I'd seriously consider it, I've needed it to improve. Also do you have personal support, a freind perhaps you can just talk with and be confident they understand and care? It make a difference.
Perhaps trying to build up your contacts (electronically I guess) during daytime might make you feel less alone. Plus Milly_cat is right, you can ring our 24/7 help line if you become too distressed.
You can also come here anytime and be welcomed (though there may be a delay of course).
I hope to hear from you again