It's a marriage in name only, isn't it?
Surely you can see that the bad bits far outweigh any good bits and all of the counselling you've had has failed to stop the rot or bring about any improvement?
If you're worried about missing the occasional backrub which seems to have been the highlight of your 'good times', get yourself an electric massage pad or chair that you can luxuriate in whenever you choose
As for having nowhere to go, that's easily resolved. Either put the house on the market now and start searching for the two smaller properties that you've said can be funded by the sale, or move into rented accomodation for which you may be eligible for housing benefit until such time as a divorce settlement has been negotiated.
You chose to extend the deadline you had set for Christmas of last year and, unless you want to be in the same situation this coming Yule, there's no readily comprehensible reason for any further vacillating on your part.