I blame that pain on my obesity

It's probably a muscle spasm. They can feel like a heart attack, stopping breathing and everything.

It is probably a small anxiety attack. Based on some of your other posts it sounds like you have a lot of stress going on. Just try to breathe and take it easy. When I get panic attacks I usually watch cute cat videos. Lol. It actually works.

It's not weird. I get those too, but I just take a straight posture and it goes away.

that could be anything.. from a pinched nerve, a blockage, spasms, angina, asthma.... even GERD.
that's not all! :P

could be a stroke