Dear Confused and hurt~
Welcome here, I've read your account and am sorry that you seem to have been put together by life with a set of people that are basically undesirable and thoughtless.
It is sadly surprising how many never think of consequences.
I do not know what the couple were doing in an environment where others had not been exposed, though might guess at some sort of drug or weed. If so then I'd think you were more than in your rights despite whatever the girl's reaction was. Only sensible really.
If I've guess wrong my apologies, if you care you could explain further.
However all of this I beleive to be a side issue. COVID is very very easy to catch and it's effects, even on the young and healthy can be fatal. If you know of someone who is, or plans to, breach quarantine there realy is only one course of action. You get it stopped, and allow the authorities to deal with the matter.
It is not just your job, but you, and even people you may not ever have hear of that will bear the consequences.
Please have browse around
We have lot the , a surprising amout encouraging, plus you can see how others have been dealing with things. Have a chat with a council there if you like, all free.
Panic attacks are truly horrible, and while it might be quite sensible under the circumstances to be fearful for your safety I would suggest you might like to go see your GP and in an extended consultation talk about your situation and those attacks.
You can't live with them all the time.
If, like me, they are caused by anxiety then they realy do need some form of treatment, even if only therapy, plus of course if you have been in contact with someone you suspect of breaching the rules, get tested.
Being bullied and having confidential information told to others is horrible, and can make you feel rather powerless and frustrated at times, even weak. How do you feel about it now, will it work and get you to move out?
Also I'd like to ask if you have a friend, or family member, to talk to and who will simply give support and care? This would all be easier with someone to lean on.
I do hope you come back and talk more, you have been having a very hard time of it and we do care, you are not alone