It is worth it, if your H commits equally as you. Yes, it would be the hardest thing you have ever gone through, and you would have to work through some things no one should ever have to go through,.... I say a lot that there have been many times where I thought how much easier it would have been to just cut my losses and run. The easier thing and the best thing are two different things. Now, I thank God every day for the family he saved for me. I'm so lucky. If you both can commit to work and change, you will feel the same, and your children will be so lucky, too. You can't do it alone, however, and I say again that your H has to be totally "in this" as well.
Hang in there, Sugar. I'll send a prayer your way right now.
And, yep, I agree that no contact unless with a counselor is the best right now. If you feel you can reconcile, start the counselor as soon as possible.