Ok, so the story goes that I met a girl at a party and went home with her the same night. We had unprotected sex. The very next day I feel some pain in my penis and am very tired. It was a Saturday night, and I fell asleep at 8pm, not waking up until 10:30 the next day. This is not normal. Day 2: there are three small yellow stains in my underwear (briefs). However, this has not occured again and there is no discharge that I can tell (it is currently 5 days since intercourse). So, days 3 and 4 are much the same. I'll say that since the day after having sex with this girl there has been a sort of tingling at the tip of my penis. It was only substantially noticeable two days after intercourse. Also, since Saturday I have been fairly tired. Now, this could also be caused by the fact that I am getting 4.5 to 5 hours of sleep each night because of summer school. But I am used to going without sleep and it just seems a little different this time. Not just being tired, but slightly nausiated, not thinking as quickly as normal, etc. Now, I have not had any burning during urination at all. It feels perfectly normal. However, there is always that slight tingling feeling when I am sitting down and on the day 3, I had to go to the bathroom a lot. I've gotten used to that so I don't really have to go as much now. Now, I am not sure how to explain this, but I feel something different in my scrotum area. It is not painful, per se, but it is different and noticeable. Perhaps the harbingers of swelling, but I do not know. There are no bumps, sores, lesions, or discolorations on my penis (so far... hopefully it stays that way). I need to know what it is that I am experiencing, and whether it can be cured if it is, in fact, an STD. How many STDs are there that can cause these types of symptoms within a day or two of exposure to it? I don't have medical insurance being a broke college student, so I have been looking on the internet for incubation periods and such to see which, if any STDs start affecting you so soon after exposure. However, as luck would have it, I am finding that search task rather difficult. Not as many sites as I had hoped are showing that particular sort of information, which is why I opted to post my question here. I am trying to think if there are any other symptoms that I should... Oh wait, I just rememberd. Since last night (Day 4) I have had a very slightly sore throat. Right now it is not really sore, but I keep having to swallow. It really isn't that bad, I only really noticed it earlier today and then recalled last night I had swallowed and felt a little something, but thought nothing of it... Ok, well I am running out of room as well as information to share, so please help me if you can. I feel like an idiot for being stupid enough not to use a condom, and can only hope it is nothing serious, but I don't want to fool myself into false hope so I would appreciate whatever information you can give. Thanks