Hi Catlady 🙂
I am a recovering alcoholic, myself - I can relate to many of the things you have described.
I have been 5 and a half months sober now and have spent most of the period between August 2020 and now sober as well, with a few slips in between. Speaking to my own recovery, I found a lot of solace, safety and peer recognition and support in the fellowship of AA, personally - the doors of AA are always open to those who want to stop drinking and I recommend this as a potential avenue of support if you feel like it may help you. Otherwise, there are quite a few mental health services that offer alcohol and other drug counselling, which you may also find helpful. I'd also like to acknowledge that you may not feel ready to access support or help at this stage, so please - do what you feel is right for you and your recovery.
A few things stand out to me as relatable in your story - not being able to stop once I pick up; not being able to control my behaviour and/or blacking out; alcohol causing me problems in my closest relationships and the crushing anxiety and depression when I awake to the mess I'd caused the night before. Moving back to my own experience, which you may or may not relate to, I also found that when I wasn't drinking, I was thinking about drinking - I was obsessed with it. When I was not intoxicated, I could barely cope with my own mind and with life - I simply couldn't handle life on life's terms and at the time, I did not know that alcohol was not my problem. Reality was and oftentimes still is my problem and alcohol and other substances were my solution to my reality problem - a bit counter-intuitive, but it rings true in sobriety and recovery.
Whether your relationship with alcohol needs to change is entirely your decision and journey. If harm minimisation and something like Cognitive Behavioural Therapy (ie: SMART recovery, AOD counselling etc) is your thing, that's great. If abstinence is your thing, that's also great. For an issue like this, I'd always recommend the help of peers and professionals - but what you choose to do in terms of defining, accessing and using that help is totally up to you 🙂
I'd also like to mention - and you may already know this - that the effect that alcohol has on the body whilst taking antidepressant medication is often pronounced. I've had this experience myself on SSRIs. Whilst that may not explain the inability to stop drinking once you've started, it may contribute to the blackouts you have been experiencing.
There is plenty of help for this available - good luck and please, stay safe - you deserve recovery and the best life and I believe that you are capable of overcoming this issue and living that life.