My fWH and I are only doing IC right now. Our M had a number of issues that were related to our individual pasts and NOT our M, so we figured if we don't fix these things within ourselves first, then there will be no chance for our M to succeed.
For me personally, I decided to only do IC because I wanted to be strong enough to stand on my own if I decided to go the D route instead of R. I figured a strong me would win either way.
From your posts, it sounds like depression may be setting in, which is what happened to me as well. Going to IC and a small dose of AD helped tremendously.
Stay strong and do what you feel is best for yourself first and foremost.