Man my brother you are in a tragic state, but please be careful about "disavow from Christ", please, that is the last thing you want to do and this will only make things worse.
I have been very blessed by God when it comes to a wife, so I'm probably not the best to give advice in this particular situation, but I have had the wife, the kids, the job, and still got to a place where I wanted to die every second of every day. I also want to suggest something that may not go over too well here, but are you sure you even truly know Jesus? I ask this because I too thought I was a true Christian before I even understood what one even was. I thought of this whole Christianity thing as a "belief system", and had my own doubts about the whole thing at times. Then my life was going very well, I was doing the church thing (like that counts for anything), and I thought life was great, and I was so very comfortable in my worldly ways. Then tragedy struck and I was really put to the test, my testimony is posted here if you're interested in the details, but long story short I wasn't even looking for Jesus when I was regenerated by the Holy Spirit, and it even took me a couple days to fully realize what happen. He came and saved me once my pride had been broken and I could truly submit my will to His, but at the same time I didn't even have to ask Him directly. It's kind of weird and hard to explain.
My main point here is that if this hard time has you close to walking away from Christ, you may have never know Him, and if that's the case then He is the answer to your dilemma here. I tried to word this as gently as I could, so if it comes off as harsh or too presumptuous I apologize, but I hope He guides you through this valley to be stronger in Him. If I can help in any way please hit me up, and if not I wish you the best in your struggles.