How do I stop analyzing the past?

Hi - I'm new here and have been going through a living hell...

Since the end of January, my Mother became very ill and passed away in April, at the same time, I had to move my Dad to a Dementia/Alzheimer's home and then, less then 2 months later, I was discarded by my soon to be ex.

I didn't know at the time he had NPD and learned about it watching a stupid show in the middle of the night (crying) and the lightbulb went on. I started reading (and reading, and reading) and figured out his problem - Everything I've told him in every argument suddenly made sense, he is the textbook example of someone with NPD.

I was discarded almost 7 weeks ago and moved out of our house almost 4 weeks ago (Saturday). I don't sleep, I don't eat (Between all the stress from the situation with my parents and him, I've gone from a size 8 to a 0 this year) and overall, have no support. I moved here for him and the only friends I have are a few from work (different from a real social circle) and HIS friends/wives.

I do I.T. work, so it's my nature to analyze. I keep trying to analyze what my ex-to-be has done to me and keep looking towards the past 8 years of my life instead of looking at what I can do to heal...

How do I get on the path forward and quit looking at the past? I've started therapy, but I just can't get out of the stage of analyzing the past.

How do I start looking forward instead of backward? I'm totally lost...