PhD dissertation burnout duing pandemic (COVID-19) I am in the process of writing my PhD thesis and it happens to be during the global pandemic crisis. My submission date was supposed to be June 2020 (we are in April 2020), but my supervisor has been kind enough to extend it to September 2020 due to the current circumstances so as to give me more time. However, I feel completely burnout, and I'm scared it will evolve into a depression. 

I don't live in the country of my origin, so I am away from my family, support system and anything familiar. I also have a tendency to feel lonely and get stuck inside my head but I went to therapy when I first moved to  where I am now and made so much progress. Normally, I have things under control, I go to the gym regularly, and hang out with friends on weekends, play basketball, go on hikes, maintain a relationship with my colleagues at the institute, and volunteer, which all help. 

But since we are in quarantine, the isolation and the PhD stress are taking their toll on me, and I feeling super unmotivated, lonely, and defeated. I have extreme self-doubt and pretty much a negative outlook on my personal and professional life. I cry daily and I feel physically exhausted even though I have been getting enough rest and sleep. I try to write, but I can't concentrate. And the more I don't make any progress, the more anxious I become. This is in addition to the feeling of just wanting to be done with this phase and moving forward with other things in life. I feel stuck. 

I don't know what to do, and I'm scared it would evolve into depression. What can I do before things spiral out of control?
From what you've said you have already slipped into depression precipitated by external factors associated with the COVID pandemic. You could screen for this by taking a PHQ-9 questionnaire which is probably what a GP would do (https://www.mdcalc.com/phq-9-patient-health-questionnaire-9) but if you are crying daily and cannot concentrate then it probably isn't necessary. 

If you have had thoughts of suicide or self harm you need to seek urgent medical help. If not, you still need to seek professional help on a semi-urgent basis. You should apply to your university's disability services or whatever it is called at your university for special circumstances and adjustments for which you will need a letter from your health provider and you should do this early rather than at the last minute. 

In the meantime, you should try online cognitive behavioural therapy websites such as Headspace (https://headspace.org.au/) or Unmind (https://home.unmind.com/) or whichever equivalent your institution may have access to.  Some have made their platforms available for free during the COVID pandemic to certain groups and this may be worth a look. You need to tell your supervisor and consider pausing the PhD or going part time if you can. 

Most importantly, you are not alone and you can find many people who have written about how the COVID crisis has negatively impacted their mental health (https://www.theguardian.com/news/audio/2020/apr/24/what-is-the-covid-19-crisis-doing-to-our-mental-health-podcast) or (https://www.theguardian.com/world/2020/mar/22/think-about-the-best-case-scenario-how-to-manage-coronavirus-anxiety). 

Don't suffer alone, get help early, know there are many people who empathise with you.