Should I quit my job? I really need helpful insights

My workmates are really fun to be with and nice. However, I was diagnosed with lower respiratory tract infection and request to my boss if I could take a rest from going on field work but I can still work at the office. She disagreed and even gave me the two field work of my coworker who is not in good terms with her.

After yesterday's field work, I wasn't able to sleep because I can't breathe. And I have another field work tomorrow that wasn’t supposed to be mine. Should I past a resignation letter on Monday?