Tip of penis (meatus) is inflammed/swollen

[Derek45062]

About 4-5 weeks ago I had an encounter with another man.  This was my first time doing this.  When we got together we both masturbated each other.  In the moment, I decided to lick the shaft of his penis making sure to keep my hand over the head of his penis to not make contact with it.  I also briefly licked his scrotum.  A week later I noticed a bump on my scrotum which I popped thinking nothing of it.  It never came back.  I then noticed a small ball point size bump inside of my bottom lip and what seemed to be brownish/reddish bumps (2) on the inside of my cheek.  I scrapped them off with my nail and they haven't returned.   Now about 5 days ago I noticed that the very tip of my urethra has become inflamed and it hasn't changed since.  I did masturbate 3 times in a course of 3-4 hours and slid the same sock over my penis in order to catch the cum.  I have a girlfriend and I don't want to pass anything to her.  I really regret meeting with this man.  Am I at risk at catching a STD or am I just really so full of guilt that everything that I would have not noticed is bothering me.   This is killing me inside and would like to know which std's I could have possibly gotten to experience the symptoms I am having.  
Also, I am NOT experiencing any burning during urination or itching.
Thank you

[Vance2335]

See a Dr, you had no STD risk.

[Derek45062]

It's been about a week since I posted this and nothing has changed.  The tip of my penis (the meatus) is still inflamed and red.   I still am not experiencing any burning or pain of any sort.  No lesions or visible warts but my anxiety level is still high.  Are you sure that this isn't a symptom of an std?  Which std's could even cause this symptom?

[Vance2335]

You had no STD risk.