Long story short, I was filling up my tank at a local gas station today. When I approached the pump, I noticed a fairly strong odor of gasoline.  I took a few steps back for a handful of moments, and when I returned the smell was still lingering, but seemed to dissipate after a few seconds.  I would say the whole exposure was roughly 10-15 seconds.  Immediately afterward I truly felt fine, just some anxious thoughts on the drive home. Fast forward to now (approximately 3 hours) I now feel some brain fog, lethargy, dry eyes, and slight chest pain.  

Should I be worried about this exposure?  Are these symptoms perhaps tied to this event earlier this evening? 

Thanks.