Welcome to PC. It does sound like you are having a tough time coping. I know it is difficult with anyone with PTSD "only" and there is more than that.

What does her psychologist say? PTSD doesn't heal on it's own. It's a beast of a disorder A good cognitive behavior therapist could help, perhaps?

What does YOUR therapist suggest for you? Why not take the medicine? Why not depend upon it for what it's there for? Once things settle down, and you are able to also, then you can revisit whether you still need the medicine or not.

She hasn't turned to alcohol to make you stop loving her. I 'm not sure where that came in. Learning to handle stress is a lifelong chore, I think, and you probably need an expert to help you both get through this. Good wishes.