On Sunday evening it was so bad I took her to the ER and she was telling me she was sure she was going to die. In the ER, they did a blood test, urine analysis, CT scan of her brain and an EKG. 6 hours later they told her everything looked normal and sent her home.
It's been happening on/off for about a month. It started 2 days after she was stung on the foot by a stingray while surfing. After being stung she went straight to our doctor where they immersed her foot in hot water, gave her a tetanus shot, and prescribed antibiotics.
No change in diet, no high stress levels, no other abnormalities whatsoever.
I suppose it's possible the venom from the stingray sting is causing strange issues, which align with what I've read online. What I haven't found is a case where it's still going on after a month. The symptoms are kind of similar to a TIA, but I would imagine something would've presented from the work done at the ER(?).
At the moment, the path is to get an ultrasound on the stingray sting location and determine of part of the barb is still present. If so, they'll have to remove it. If not, then we are totally stumped as is our doctor.
I also suspect the shortness of breath is a reaction to the 'episode' and her anxiety levels jump, but could also be related.