Geekgirl,
I feel alot of those same things. I force myself to be motivated no matter how much I don't want to. Nothing seems real fun, real exciting or real worth it. Some days I just take the day off and veg without feeling too bad. I know I need it.

The time with your ex might have been hard on you but maybe it gave you a new outlook on things and a realization that you really shouldn't be with him. If spending time with him is so emotionally draining on you than it's not a good relationship for you.
You've gone thru alot and you said you have come a long way. Life is still hard but you can make it thru the rest. I have no doubt that you have the ability to continue to make changes and make your life better. Maybe you just need a mental break so you can start fresh again.
Sending hugs and a wish for a good day :O)
Heidu

The highest reward for a person's toil is not what they get for it, but what they become by it.
John Ruskin