I have impossible and infuriating nails! Looking for suggestions

Hello, I have impossible nails and I'm sick and tired of it. I used to be able to grow them to a reasonable length and keep them for a week at a minimum but over the last few years I can only keep them trimmed basically to the quick because so often they catch on something and snap or tear and I have to cut away at them to avoid any further catching and damage. They also flip concave often and it's painful.

EDIT For clarification: my nails will flip with some sort of force. They might catch on something as I'm passing and the movement flips them or more often it's that the tips come in flush downward contact with a hard surface and instead of holding firm and protecting my fingertips they flip inside out. Sometimes they flip right back in an instant, sometimes I have to manually flip them back and often the edge of where it flipped will cause the nail to split on the line partially or entirely.

I eat healthy, I am on all kinds of supplements and tried ones for strengthening hair and nails and even regularly applying nail strengthener and/or applying multiple coats of polish to hopefully re-enforce my nails... nothing works.

The nail strengthener chips or peels off within a day and if I try to repair a broken nail with crazy glue it peels off too the moment I wash my hands.

I've tried really roughing up my nails with a file in hopes of the polish or glue or strengthener to have a better surface to grab onto but it makes no difference.

I really miss having nails, I wish I could at the very least use up my many polishes before they dry up and are unusable and I also miss having long nails for scratching purposes ( I have eczema).

What can I do???