Thanks for consulting HealthcareMagic!
Symptoms as you mentioned like losing weight, loss of appetite, excess thirst has lots of other causes than to think about Infectious Mononucleosis
. But if you want to rule it out, there are investigations like monospot test to rule it out. I suggest a Gynecology visit based on your symptoms. You may need routine investigations like CBP, Conplete UE, Ultrasound
Abdomen/ pelvis. Hope I have answered your query. Let me know if you have have any clarifications.
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Wish you good health!