Is this Epididymis? Or a a STD?

[Genneral]

About a month ago I picked up a prostitute from the street. She gave me a ******** WITHOUT a condom, 3 days later I started getting really worried about what I did and went to the doctors and got a HIV and STD test.which all came back negative. About a week later I'm having lower abdomen pain near my groin which is swollen and bloating also my testicals are reddish and swollen and has a lump/bump. My questions are:

1. Why am I having lower abdomen pain and swelling near my groin area?

2. What kind of infection do you think I have? What infection is it possible to get from a ********?

3.will the swelling and lump/bump go away on its own

4. Do you think anxiety/stress has anything to do with these things because it's been a month and all I do is think about what I did.  

5. Is it possible for me to have a infection/STD which a doctor can't detect?

[Life360_Dave]

Hi,
1. not an std symptom but white puss penis discharge and burning while urinating are.
2. you appear to have more of an injury from the act itself.
3. have a doc look at the lump
4. possibley
5. no