Do you tell yourself that, in order to be a strong, successful, productive human, you need to have zero tolerance for anxiety? I thought so. You think that if you ignore it, it will go away. The problem is, that doesn't work. Ignoring it makes it worse. To stop anxiety holding you back, you need to hit the pause button - yes, including on that thing that you really should have finished last week - and take a long, hard look at your anxiety. Here's your guide on how to do that.
Here's some useful info and resources at cognitive behavioural therapy (CBT).
The Academic Imperfectionist