Hi CiderMonkey,
Not sure if you sound depressed, it does sound like you've had a lot of change in your life which can just flat out tire you out. Also, moving house is up there as being as stressful as a berevment. Perhaps you need a holiday and some time to relax on your own, you could be suffering from burn out... I know I get that way sometimes and it does usually go. Are you burning the candle at both ends too?
Everyone wants to curl away and hide at times, whenever I do feel like that it's exactly what I do but I set myself a time limit... e.g. right don't want to see or talk to anyone this weekend so am going to curl up with cd's and a book but I'll make plans to meet up with someone on monday or something so that I don't get stuck in a rut with it cause that could cause depression.
Ultamately, if you are really unsure then you need to visit your GP for a proper diagnosis.
Good luck hun, don't stress xx