Thank you for explaining your situation more - it makes total sense to me that you're not happy in your current job and that it's drastically effecting your mental health. I know it is not happening right this minute, but I am so pleased to here you have steps in place to change all of this! I really hope the sale of your house goes ok and that you can move and get your new life rolling soon.
The new location/house coupled with the new (but also old) job sounds excellent. I'm sure it's daunting but you will do great, I'm sure of it, and the guy who offered you the job obviously has faith in you. Anything you struggle with, he will help.
Hopefully this is the change you need. I really think it is. How can it not be??
You must be really excited to be being close to doing what you are 'meant' to do.
Try to hang in there, this right now is only temporary until the next stage - seems you have things figured out and I think the job change will do wonders for you, and you will begin to feel like YOU again, the you you want to be. You'll be doing something you can really feel proud about.
Lots of luck with the sale, keep us updated x