I have to keep busy, too. I can't stand to just sit around doing not much of anything. This is a big change for you and what you are going through is normal. It's a type of grief in a way. You probably wouldn't be doing this if the job had worked out better.
But, look to the future! It's a sad time but also a time of excitement. You will be with your SO and that's good. You will have a change of scenery and probably a better view out your window and no smoking neighbor either. AND, you just might be surprised when it comes to job hunting. Jobs are out there. You have an advanced education and you are quite intelligent. These are big pluses for you.
So, start looking forward to each day with anticipation. You are almost done with the nasty part of your move and now the enjoyment part is coming down the road. I do personally think you made the right decision...with all the info you have given us. I think you will be far happier in a few days.
Sherrine