About 4 weeks ago I was intimate with a girl which is not my wife. We were in some kind of pay per hour motel. The girl is very clean and I'm sure that she doesn't do that every day, and I know her for almost a year. There is nothing physically wrong with her and she is married for ~10 years as I am. For me this was a first time in 10 years. We were unprotected. For a week now I have some strange feeling inside my penis, followed by some kind of pain on both sides of the abdomen close to the thigh. There is also some burning after urination. The urine is clear most of the time. Lately, I feel lightheaded and sweaty, in the evening some fever eventually develops, making me tired and sleepy. No other symptoms are present for now. I turned to my primary doctor and he sent me to the urine STD panel PCR, which did not return yet. Being concerned, I watched the info over the net and got 1g AZITROMIYCIN followed by 3 days of 500 mg of amoxicillin x3 time a day. No improvement of the overall feeling. This makes me think that I have trichomonas of something that is not cured by the two types of antibiotics I used.
The question is this... Assuming that neither of us was infected before the contact, what could be the source? The bedding in the motel, the towels, the toilet seat? Also, What are the symptoms consistent of? Can I pass any of the STD condition to children by sharing utensils, bed, bath etc?
And last, but not least, considering no other symptoms are present, should I also get tested for syphilis?