It's good your wife and you decided to seek marriage counseling. I wish you the best. I can understand and relate to your exhaustion and tiredness with everything.
My husband and I started marriage counseling two weeks ago. We only had one session as a couple. The other two sessions were individual so she could understand each of our perspectives. Thankfully, she has a very good understanding of addictions. I barely had to say much the first session. She stepped in a handful of times and finished my thoughts. A sigh of relief. For many months, I felt like I was swimming upstream against a very strong current by myself. I was the only voice of reason with my husband. Finally, I had another individual echo similar words to my husband that I had spoken.
I hope you have a similar experience like mine. It's a challenging road we all face and every bit of support we find along the way is wonderful and much needed. Hang in there. You're not alone.