Tender/swollen penis

HELP, I'm extremely nervous right now. About an hour ago I was experiencing a tingle in my urethra which I usually calmed by stretching out my penis for about a second, it would always get rid of the tingle. When I went to do what I usually do, I experienced a sharp pain almost like a Charlie horse in my penis BUT I did NOT feel or hear a pop like some websites state. Shortly after my penis has shrunk in sized and is sorta of springed up. Although I don't have an erection, the base of my penis is very tender and hard. I wouldn't say swollen because it hasn't increased in size and it is not red. When I tried to pee, it came out easily but towards the end it started to sorta burn and it cut off the stream before I was done. I just shook it to get the extra drops of urine out. It does not hurt, and if you apply pressure it only feels uncomfortable. I have read online that I could have structural damage to my penis an could possibly permanently harm it. What should I do? I am also circumsized. Please respond quick.