Diagnostic Tests

[mdv]

Hello, I no doctor at the moment to ask, and something happened two nights ago that I need a solution to, or, at least a better understanding of what measures I should be taking. anyways, I was masturbating, and, holding the tip I felt a snapping very distinctly, and instantly I could visualize two veins snapping just under the head and sinking down the shaft. I went to bed, and the next morning I found that just underneath the skin of my penis, along the shaft and curving around the left side up to underneath the tip of the head there were tracks; like pin-needle tracks. These lines were sunken-in, obviously the veins (or whatever) that had once been there have, like elastic bands, came undone. The skin underneath my penis now seems more shabby, more loose, and there is a sharp line of pain where I felt the snap that night, underneath the tip.
Please, I'd like to know what this is, and maybe a suggestion of what to do. Or at least a "it's nothing to worry about" statement, because this has got me worried.

-MV