Was doing a tempo run last night and was pushing the pace a bit and all was fine. in the last few mins of my cool down I got this horrible sharp pain along my rib cage just under my chest (not a typical side stitch location). I had to completely stop and walking was even a challenge. Got inside and all was good about 5 mins later. No idea what it was, what caused it, etc. I’ve been running for a loooong time and never had anything like this before and I am in the best shape I have been in a long time as well. Anyone else had this by chance?