Your symptoms are not characteristic of Mononucleosis
. However, you say that you were previously diagnosed with Mononucleosis and you probably feel it is relapse of the same. But, I think otherwise. To me it seems like a new and different infection. It could a urinary tract infection
or even an infection in the Genitals.
Get a urine routine done and probably a vaginal swab culture as well to look for any offending organisms.
scan of the whole abdomen is of added benefits too.
I wish you quick recovery.