Maty,
I'm not sure on the counter effective side, at reasonable levels of alcohol they tend not to be but I wouldn't be confident about heavy drinking. Doctors are often fine with moderate drinking but I think it depends if the patient is in a good place, at least that's how I took my GP's decision over my request to drink on holiday.
I would say if you are ever offered the med I'm on, Duloxetine, make sure they fully understand your units because this med does carry a warning about heavy drinking & liver disease. I doubt they would consider it, but just in case...
What is certain though is that alcohol causes your Serotonin to spike, so you feel good. I suspect a part of that horrible few days many sufferers have comes from the reduction following the spike and the body using the nutrients it needs to build those Serotonin levels back up.
The down regulation effect of SSRI's would remain unaffected by that but it's about making enough Serotonin too otherwise the boosting effect it has by way of stimulating more Serotonin to be absorbed is not going to be happening to the same degree.
I suspect the heavier you hit the booze in a session, the more that gets amplified.
I was glad to hear your GP knew, sufferers have a habit of not being so open & honest. That's one step you got beyond and I think we should congratulate you on that!