The symptoms as well as the history of lifting heavy weights (as mentioned in your post) suggest that the pain might be due to muscle pull.
There is nothing to worry.
It usually subside on its own.
To provide symptomatic relief you can apply analgesic
ointment or take muscle relaxants.
tablet can also be added.
Also make sure you do not put strain on your chest & abdomen muscles.
If the symptoms persist or aggravate, then it will be better to consult your Doctor & get a proper physical examination done.
Wishing you a Good Health. Let me know if I need to clarify further.
Thanks & take care