I think I only started feeling burned out in the past few months, despite doing a masters degree in parallel with full time work as a software engineer for the

I think I only started feeling burned out in the past few months, despite doing a masters degree in parallel with full time work as a software engineer for the past 3 years. Now that I'm supposed to be working on my thesis in my "free time" when there's little diversity in the proper free time, it's been weighing on me. I can barely focus, the hours when I'm doing my job are actually the most pleasant because I don't have to worry about the pressure from the project. Lots of problems going to sleep as well because I keep worrying I'll fail the masters. While there's no proper pain involved (maybe a bit of anxiety from time to time), my productivity has taken a huge dip and it's really frustrating.