Yep, i know what you are talking about completely. I came home yesterday and was fine, really excited about seeing my family and friends again, but today ive just been a bit...meh. Ive organised all of my work at Sainsburys, which is good because i need the money, and i need to organise lots of driving lessons before my test in January (Ive got my first one since September tomorrow and am NOT looking forward to it!) I miss my uni friends already, even though i only saw them all yesterday morning and one of them rang today and I had a brief 'text' conversation with another because she is going abroad for a month tomorrow. Im better now than i was earlier...but I was just sitting at the pub with a few friends and felt quite deflated...no idea why. You are not alone!