Thanks for your question on Health Care Magic.
I can understand your concern.
In my opinion, you should get done ecg and 2d echo to rule out heart diseases because these symptoms are not normal after
costochondritis.
So better to get done ecg and 2d echo.
If both are normal than no need to worry for cardiac diseases.
Sometimes
musculoskeletal pain can also cause similar symptoms.
So avoid movements causing pain.
Avoid bad postures in sleep. Avoid heavyweight lifting and strenuous exercise.
Start painkiller and
muscle relaxant drugs.
Apply warm water pad on affected areas.
Don't worry, you will be alright, but first rule out heart diseases.
Hope I have solved your query.
Wish you good health. Thanks.