^ I'm glad overall you are better but really sorry things are still tough at times.. unfortunately we can't help you find drugs, however!
And Xanax is not the answer
at all - it is a benzodiazepine (benzo for short) and is physically and mentally addictive. Tolerance and addiction can set in very quickly, and it will make matters much worse believe me.. It can help with panic attacks in the very short term, but it really isn't a good treatment for anything else - you will find yourself with a horrible benzo addiction (and benzo withdrawals are not just unpleasant but can be dangerous/life threatening too..)
In addition, benzos are generally used to treat (or mask the symptoms of) anxiety, where as you are describing more waves of depression combined with being at University in a foreign city. That in itself is a big thing, without recovering from this as well - perhaps you just need a bit more time to let yourself recover and settle back in?
Counselling sounds like a great plan. It is always best if you can be completely honest with your counsellor. Usually there is a strict level of confidentiality - if you are concerned that your counsellor might tell the University that you took drugs, perhaps clear up exactly what they will and won't tell the Uni first - but to be quite honest I doubt they will be concerned - a huge number of students experiment with drugs, and it's not like you are continuing to use drugs in a damaging way.
As for Uni - have you tried joining any groups or societies? There are often all sorts (I joined cheerleading, circus skills, cheese-tasting, electronic music, Buddhism, environmental activism, knitting, gosh all sorts.. dropped most of them but they are a great way to meet people!) and often Universities have extra social events for international students. They're not just good for meeting people, they can be a great distraction and it gives you a sense of achievement to make it along every week. Do you feel like you could try to talk to any of your current friends about this too, even just that you are feeling a bit down and finding socialising hard right now?
Finally, most (all?) UK Universities have a student health service. A doctor will not tell your Uni or anyone about the MDMA and if they are part of student health they will be used to this kind of thing. It might be an idea to see one as well as a counsellor, just so you are getting all the help and support you need.
London can be a daunting place, but exciting too, I am sure you will find your feet there again. I'm from the UK (although not London) - feel free to pm me if you have any questions!
Good luck
