Wolfy dog, I'm very sorry to hear this. I can't imagine the dilemma you're going through. Some of us here has given you some positive suggestions. Do you have a relative or anyone who could take care of your dog? If possible, you can try and give yourself a timeline for example, maximum 6 months and if God forbid your situation doesn't get better, it's time to re-home? So then you'll know for sure what to do with Griff.
And Ozzy, I'd have to disagree with you. People especially people with experience don't just zap and zap to keep their dog. They zap for a reason and I personally use e collar too, and it's been working wonderfully. E collars are created for many reasons and training purposes, doesn't make us bad people to train and control our dog using e collar as a tool.