I am not a doctor or epidemiologist, but I gather that it takes at least two negative RAT tests to be meaningful.
Yes, definitely try to figure out why you're feeling miserable if it's not covid -- I get the feeling that a significant number of people believe, or are acting as though they believe, that covid is the only relevant infectious disease. If you (one) tested positive for covid and then test negative, it's reasonable to treat that negative test or tests as meaning you're recovered; otherwise, a negative test only indicates "not covid," but says nothing about any of the diseases we knew existed before 2020.
no subject
Yes, definitely try to figure out why you're feeling miserable if it's not covid -- I get the feeling that a significant number of people believe, or are acting as though they believe, that covid is the only relevant infectious disease. If you (one) tested positive for covid and then test negative, it's reasonable to treat that negative test or tests as meaning you're recovered; otherwise, a negative test only indicates "not covid," but says nothing about any of the diseases we knew existed before 2020.