I definitely agree with the above posters that a therapist may be a good idea to look into. They could possibly be the ear you need and someone to help you decide on next steps. Actively seeking help generally looks good to an employer. Not, not as much. One need not go into details beyond "I appreciate your feedback and am seeking help/assistance to feel better".

I also agree that you try not to catastrophize. Many people experience hard times (even non mental illness related) and get through them. Though I imagine why/how you look at your mother's situation as a possibility for you, it does not have to be.

It's impossible for me to really know what is going on in your boss's mind, I agree more with Pookyl that your boss sounds nice. Based on what you wrote, I do not feel inclined to think they want to fire you. Just the opposite. I think they likely really value you. Again, I can't be sure. I only know that I was in an even rougher situation at my last job and recognize that their intensions were more good than bad.

If things get really harder, is it possible for you to work part-time at your job for a bit?

Twenty six is still very young. Please don't let yourself think great possibilities may be over at such a young age. I'm in my mid-late 40s, and I don't feel that way about my situation. Even if my path is different from this point on than I thought it would be at 26, the path can be a good and productive one. Based on what you wrote, you've already achieved a heck of a lot at your age. Know there are almost always going to be pauses, hiccoughs, forks in the road, etc. in every person's life.

Welcome to PC. We're happy to be here for you as a kind of support.