Had a sharp pain in my heart this morning. now i feel uncomfortable as there is a silent pain and makes me uncomfortable to sleep. i did a few pushups 2 days ago. now having muscle pains. could this be because of that or this could be something else?

Muscular chest pain: After doing pushups and then having muscle pains, this is most likely muscle pain. There are muscles on the front of the chest in front of the heart that may be strained by pushups, especially if you don't do this exercise regularly. You can try some over the counter anti-inflammatory medication like ibuprofen or naproxen for a few days and it should resolve. Best to take those meds with food.