Anxiety and depression make it more difficult to concentrate on study than for average people. So kudos to you for almost getting through you degree despite it all.

There is a pattern here of obsessing about how useless you feel. Time to turn that around somehow. Question of finding a chink in that pattern, some way to feel ok which isn't running away.

For instance I have a pattern of self-hate which makes me sleepless and nauseous and then I crave sugar. It's a big deal - really compulsive.
I made an internal agreement to take a day off from criticising myself. When I took my day off I also stopped wanting sugar, and bizarrely, the next morning the self-criticism was less obsessive. That was my chink: to purposely take one (weekend) day of being gentle and non-self-hating.