apart from a weekend in Vegas you haven't been anywhere else since you have been posting here
I bet you cant leave the country.
What part of the UK do you live in? Taking a vacation is not a bad idea. The principle behind it is to just get out of your normal routine and scenery. If not possible, then try something else along those lines. On the weekends, (or whatever day are off from work or free), take a day trip somewhere in the UK. Force yourself to be a tourist for one day a week. Go somewhere, do something, see something - even if museums aren't your thing, go to one or do some other completely silly tourist thing - just do something different, see something new, eat lunch at a new place you discover on your own. I can't promise this will cure you, but it can't hurt can it?