Relapse of Plasmodium Vivax can be upto how many years? Is there any treatment for complete cure of PV Malaria ? Is there any drug which act on the Exo Erythrocytic cycle of PV Malaria?

Hi,

10 years ago I was in the north of Thailand in a Malaria hotspot, I was bitten numerous times and was not taking any anti malarial drugs at the time. A few days later I became quite ill and was admitted to hospital for 4 days in which time I was regularly tested for malaria which always came back negative.
In the last few years I get struck down with what starts as a bad sore throat then manifests into flu like symptoms, shivering, fever, head aches and complete exhaustion. I normally suffer with this a couple of times a year. I was wondering if I could of contracted malaria all those years ago as I believe it is not always easy to detect?