Have you ever visited a doctor?
Just for a general checkup, without mentioning POIS and NOT to get antidepressants.
Yes, stress is a killer for me too.
Other questions:
1) How is your sleep?
2) What is your diet exactly? What do you eat? Are you vegan/vegetarian or anything else that could lead to deficiences?
2b) Do you take in enough salt?
3b) Do you drink enough? I can recommend alcohol free wheat beer with lemonade.. if you're without access to that, you might want to try something like Gatorade..
3) Do you have dental problems?
4) Have you tried breathing exercises?
5) Have you tried taking walks in nature? (I feel bad if I don't take a walk daily..)
6) Have you looked into taking a multivtamin? You can do this ASAP. For physical weakness, additionally I have good experience with ALCAR and Q10.
3 days before re-starting work is a bit little, but if I was you I'd try Ashwagandha Extract and Rosea Rhodiola. Both can help to stabilize mood, anxiety, testosterone, stress resisence, ...
PS: I cannot abstain, if I abstain for too many days (like a week) my brain and mind