No you are not jumping the gun too soon. I think at this stage you should set some boundaries. I'm sure you know that there is nothing you can do about the OW so I'm asking you to let that go that will run it's course. So you are having trouble sleeping? If you are not see a counselor for yourself I highly suggest that you do as it will help you tremendously. You may also benefit from taking anti-depressants they can really help keep your emotions in check and help to focus more clearly and help take your sadness away. I can tell from your posts that your thoughts and feelings are all over the place.
At this time there is no work for you to do on your R with your H. The work that needs to be done is on YOU. You cannot work on a R with someone who is either not ready to work on it or doesn't want to work on it. What detachment means is letting go of your H and the power he has over you and your R. It is a time for you to focus and YOU and becoming a better person. It is also a time for you to show your H that YOU will be fine without him in the picture because in reality whether you believe it or not you will be fine without him.
It's time for you to take action to make yourself feel better. What are you doing for your GAL activities?
M 44 W 43 S 23 S 15 INILWY 9/11 Divorce Mediation started 3/13 June 30 the day W is moving out