As others have said, moving is a huge, stressful upheaval. I think you need time to yourself to adjust before even thinking of helping out family. You also say the last few years have been difficult and I wonder if you really recovered from them, or if you really needed more time before embarking on this move.
I know from experience that it takes time in a new area to find the things you need, not only the day to day things you took for granted in the old place, but real friends, routines and favourite places. So I suggest you "press the pause button" and if you can, slow down and tell family you're taking time out for yourself. Perhaps you could mark out some time each week on your calendar to explore your new area, find a new park to walk in, a favourite cafe where you can start to become a local, and try again to find a daytime class you'll enjoy. Sort out your paperwork slowly, a little at a time. Then, gradually, after a while, find a couple of slots where you can offer some help to family. Don't overburden yourself and don't be afraid to ask for their help too.
I'm not sure if this will work for you, but the important thing is that you don't keep feeling overwhelmed and out of control. It's best to have a chat with your GP if things become too much.