Xiphoid process pressure

Ok.. this is a little embarrassing.
so im 17 now and a couple years ago me and my friends were messing around on the trampoline doing flips and such, i attempted to do a back flip by bouncing on my knees first. It went horribly wrong and i ended up landing on my back with my feet like completely over my head. It hurt soo bad and it was hard to breathe for like 5 minutes straight. It put soo much pressure on my sternum that it was sore for a couple of days after.

anyways.. i never went to the doctor.. and ever since then.. i still feel pressure behind my xiphoid process.. as if it was pushing against my liver or lungs.it really uncomfortable but ive never really PAID that much attention to it until now.

If i change positions or stick out my chest and stretch it goes away but im still curious if i should get and xray or medical attention?

this is a little ridiculous.. but better safe than sorry?