@michelle1075 I am not trying to be an alarmist, but I think you should contact your primary caregiver's nurse line or triage line now and describe your symptoms.

Costochondritis typically affects the sternum, and sometimes the shoulder and arm, but does not necessarily radiate all the way around. It is an inflammation, so if your press where your sternum and ribs join, you should be able to feel sore spots - much like pressing on a recently bruised joint.
https://www.mayoclinic.org/diseases-conditions/costochondritis/symptoms-causes/syc-20371175
Depending on your other health conditions, this could be an indication of a heart attack, and should not be ignored. There is a simple blood test that can be performed to rule it out. After that, if it happens again, you can explore further to find the cause.
https://herheart.org/wp-content/uploads/2019/06/HH_KnowTheDifference.jpg
How are you feeling today?