Cali, obviously it doesn't look like you're about to drop dead BUT you could go and just get checked and at least find out if there is anything internally going on.  When I got kicked in the stomach, I never quit working but I did get some medication and ran some other tests later to make sure it was all gone.  So you won't necessarily have to quit working but you can at least make sure you're ok and later when Nationals is done, you can focus more on your health.  I understand the need to work, I didn't quit working with my herniated disc and I was back to work less than 2 weeks after my back surgery.

The Drs I work for couldn't believe how much I was working with a herniated disc but I had to.  So going to the Dr doesn't mean you'll be obligated to NOT work, Drs can't force you they can only give you advice.