Hi John,
Sounds like you have lot's of tough things going on in your life right now.
I certainly can relate to the fact of wanting to escape the tensions and pressures of work etc by having a drink to "Calm" the nerves.
Of course only you can decide if you are a Alcoholic, although I can tell you that people who I know whom to do not have trouble with drinking, do not almost pass out from alcohol right before a big presentation. For me I never thought I had a problem drinking until I realized that not everyone needs to finish a bottle in one sitting. There are people out there that can have a half a glass of wine at dinner and that's all they will touch. They will actually not even finish the half glass of wine. I was not one of those people.
I too had a sponsor with 30 years under his belt. It was not easy to follow his advice by going to meetings, of course I did not "Want" to go, my mind was always trying to make excuses, "I am not like "Those" people" etc. But truth is the Meetings saved (And continue to save my life) There are many many different meetings out there, I was always told to go to many different meetings and find one that I really liked or connected with. It really makes the world of difference. I urge you to keep going especially when you don't want to go. You have 6 months under your belt, that is a great accomplishment, you have been given a gift of sobriety, I am sure it was not "easy" to get to where you are today. You are always free of course to go back to drinking but we are never guaranteed a "second" chance. We just don't know if we will make it back before it's too late. My advice would be to urge you to hang onto your Sobriety and guard it very carefully, you worked so hard to get here, you can totally make it through this without drinking. Remember why you stopped drinking in the first place, remember all the negative things that drinking did to you and your life. Write it down.
I am one of those people who also went to therapy, I had a therapist who understood addiction, I would really urge you to seek a Therapist out in addition to meetings. It sounds like you have some decisions to make in regards to your relationship. You have so much going on right now, no wonder you are so stressed. It would be really really good for you to be able to speak to a specialist. This really helped me when I was dealing with very stressful situations and decisions in my life. It may help for you as well.
I hope that you find the help and support you need.
All the best,