My wife has cut alcohol off completely from her diet, now that she is breastfeeding. I don’t fancy taking such extreme measures and I don’t think you need to, either.
I literally put a can of beer inside the fridge yesterday because TGIF! Every Friday, I savour my cold can of Asahi beer while feeding my baby girl. It is to reward myself for surviving the trials and tribulations of the past week. I suggest that you incorporate such small indulgences into your life. Gymming and walking are fine, but they also sound like exertions, albeit in fun n productive ways haha.
Hugs mate. Life is tough, but so are you.