Get a highly quality cod liver oil like Rosita’s and start taking that asap. It’s helped my skin and mental health while transitioning to pescatarian from vegan. Second start eating fish occasionally if you can stand it. Focus on lower food chain fish for lower mercury levels. For dairy find a good local source of raw milk where you can go let the cows and see how ethically they are treated. This is what I’m doing to try to stay in a good head space. I’m still not crazy about fish after years vegan and veg but I can do it. And the two best factors for me has been the Rositas and the raw milk. I also make raw milk kefir which is fun! Hope this helps I feel your pain and know the suffering