I hope your feeling better by now, but if you're not, I honestly wouldnt worry about it... I get alot of tingling in my upper stomach, but I think its like the muscle pain, thats what my swimming coach says it is.... also, if you had a sv, yes you'd feel it alot in your stomach but in your middle stomach... also I have been having stomach cramps this week but I havent gotten ill, so Ive chalked it down to anxiety and theyve eased of a bit... also if it was a sv, you'd be screaming in pain as I remember clearly... you always know for sure if you're actually ill... hope you feel better x