[limey]

Oh Bri! I haven't any suggestions that will work a magic fix - but if you are getting depressed then get the meds for that sooner rather than later. That will help you to find the energy to deal with things better.
Is there any way you can get extra help for your parents, since they clearly need it? I don't think you should carry on trying to cope with putting the world right for both the generation above and the one below you. I think that should be your priority to get that responsibility off your shoulders, or at least shared around more.
I do know how draining it is to be carer, even off-site, for a parent with memory problems.
Big hugs to you, dear, from across the water.