Thank you very much for the reply.
Now I feel better. I always get worried about something really easily so I was really stressful and cried a lot these days. I'm gonna prepare for the documents which I can show at the immigration.

Hi. I am Japanese and I'm really stressed out these days, so I would like everyone to help me out with the problems which I'm having. I'm going to UK from this December for 3monts to visit my boyfriend and friends. I studied for a year in Scotland as an exchange student from August 2009 to July 2010...