I strongly suggest you take a week off - don't expend valuable energyon trying to control the things that are stressing you. Check in and say hi to friends on Twitter (or suchlike) by all means, so that nobody has to worry about you, but don't put pressure on yourself to get to the bottom of this or resolve it within a certain timeframe. You haven't done anything wrong that I can see so there's no particular reason you should knock yourself out trying to untangle the situation.

Watch some movies, catch your regular classes (or skip a couple if you can), read that fat sci-fi novel - fill in the blank. FI anyone you don't know calls you on the phone just tell them you're not interested, goodbye, and take a rest from the internet. After a week, chat to a lawyer and work on the fact that someone is harrassing you - might be an intelligence service, might be criminals, but make it your lawyer's problem. The best thing for you right now is to recharge your batteries and that putting some distance between yourself and the source of your stress. The best way to deal with your computer being hacked is to leave it switched off; not least because your lawyer might advise handing it over to a forensic analyst for an audit.

But primarily, take it easy and be good to yourself. Nothing obliges you to wear yourself out responding to the behavior of others if it is making you stressed or unhappy.