I feel you, it's hard to get things done, it's hard to track every thing that needs to be done, it's hard to maintain a balance when things are difficult at work.

The past I have pursued an ADHD diagnosis, and gotten medication. It helps a lot, it provides emotional stability and the ability to focus on something without getting distracted all the time. Task initiation is still difficult though...

I don't anybody has a perfect solution but there are things you can try:

1. Prioritize your mental health and not your work. It sounds difficult, I get it, if I don't get paid me and my sister aren't going to have food on the table. But, having a balance helps you be productive, which in turn helps you maintain a job.
2. Make lists, your brain will forget. Also, having things written sometimes helps with anxiety (though seeing the volume of things to be done can be intimidating)
3. Routines help a lot. It's hard to establish one, but once you do it make things easier. Remember to make them interesting, but don't depend on that. Your brain will get used and get bored easily, but you got stick to it, until you no longer have to think about it.
4. Remember to take a break. It doesn't matter how productive (or not) you were, you get tired from all this anxiety. Just allow yourself to be free a few hours every once in a awhile.