I'm sorry that you are hurting so badly. I agree, please go to a doc asap. If you need to get on meds, please do so. They helped me out immensely.
Plus...I see positives..your husband wants to be friends. That's a huge positive...in my opinion, you've already won half the battle.
He said he thinks you've been checking up on him. Well that gives you a clue as to where his head is at. I suggest you go the non-pressure route. Don't call him/contact him in any way. Find your own hangout and friends.
Let him come to you.
Have you read Divorce Remedy? How about Fire Your Shrink?