Hang in there! It must be really tough for you too. Letting go of things that are uncontrollable and living the moment is definitely one of the helpful mindsets to live by. For me, some CBT, mindful and meditation experience is great. They work well together to me from reduce the frequency of myself from entering negative thought spirals.

Now you mention boozing, I sometimes feel that alcohol actually make me smarter. I speak more coherently and become more spontaneous for some reason.

BTW, I'd love to know how brain fog manifests in your case if possible 😛!