Suggest Treatment For Burning Sensation In Penis During Urination

Tip of my penis has a dull burn, and its like fire when I first start to pee. I recieved oral sex yesterday morning from a woman I had met the night before. I am a 28 year old male. I have had chlamydia before, but the sensation seemed different and I felt an Itch lower down the urethra. The burning started last night when I came home and normally goes away a few minutes after I urinate. The tip of my penis is always sensitive though, but it only feels like the top portion is affected. STd? UTI? Urethritis? I m on my way to the mountains for four days... and Im going to suffer... but the docs couldn t fit me till i get back. just looking for some advice...