Re: stomach pain
Well, Dr. Yorkylover considers your situation to be "settled."
As actual physicians, we listen to your lungs because ultimately, that's where a clot can end up as it circulates through the vascular system. If you're presently taking any form of birth control or estrogen replacement therapy, then I'd be more concerned about a clot.
If this is a single episode, then I'd hardly become overly worried. There's a lot of territory at the "lower stomach" area regarding pain described by patients, which could actually mean anything below the diaphragm near the ribs all the way down to the pelvis. It's really not all that practical to make assumptions about the cause in a single self-resolving episode. You can take a breath and relax. If the pain returns, then your primary care physician can look further by ordering a few tests. Regardless, this should not raise concern on the order of a life-threatening event of any type.
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Best regards and Good Health