I can feel mine in my left ribcage. Never puked and can eat with them. Clears up after a few days for me. I never had spasms though.

Bodoni,
I hope that this is not an obstruction, partial or otherwise...they suck.
Just to test the theory, I might try going on a hot fluids diet for 24hrs...hot tea, broth, soup etc...use a heating pad on you abdomen and lower back and try a touch of yoga stretching and see if any of that gives you some relief...not sure if you are sedentary at work or not but I would up my walking too for a bit...maybe a small walk around the office or block every hour...and chart your intake/output including what, when and where for a while...it gives a pretty good snapshot of what is going on inside.
I was never obstruction-prone but like a lot of stuff that changes with age, that too came to pass and now I get some small ones a few times a year...could be positional, food or a kink but they pretty much resolve themselves.
Hope that it is nothing serious and it resolves quickly.
Sharon