Overwhelmed

Hi, i am new here.. I'm not so sure about how to write things here. Currently i am feeling overwhelmed with my life. I am trying to finish my masters research, but i just can't finish it no matter what i do, i always feel like whatever I'm writing or working on os never enough.. as if my work is not worth enough..i tried doing it everyday, but still there's always more to correct. And the corrections are my own corrections, it's not even commented by my supervisor. Am i overdoing it? I used to be a very perfectionist type of person till everything went downhill few years back, my personality changed. And that's where my anxiety issues started. I started to have anxiety attacks on the eves of big projects or programs. I even resigned from my job last year due to that. I felt like a loser for not being able to finish my tasks on time. I always had the thoughts that i will never reach the standard that they want. I am having a job interview in few days, i need to prepare some presentation for that. I was informed today. As i was planning, I started to lose my way. What should i do? I know staying calm will help but it doesn't help with my ability to finish the tasks, neither the research or the presentation. 😣😣😣