im a gay man 25 years old. for 2 months since i had a particular sexual encounter i have had flu-like symptoms. beginning with 1 night of fever and sore throat. 2 weeks of runny nose. i then got antibiotics for a chest cold. about then i began experiencing muscle cramps, chest cramps, fatigue, and primarily upper abdominal cramps. over the last 4 weeks i have some diahrrea, chronic abdominal cramps. right now the chest pain, sore throat and runny nose have returned. both std and standard blood tests have been negative.