HI, thanks for using healthcare magic
The fact that the pain is occurring as you bend over and is a pulling sensation makes it less likely to be heart related pain.The fact that it is occurring with a particular movement means that it is more likely to be related to the muscular skeletal system
Though everyone may have different symptoms, in general cardiac pain is usually central, tight or heavy in nature, worse with activity (not a particular movement but general activity), associated with shortness of breath
and palpitations, it may be relieved by rest.
is normally associated with weakness or abnormal sensation in one half of the body.
You can consider visiting your doctor for assessment of your discomfort. If he or she believes it is musculoskeletal then anti inflammatory pain killers woiuld be likely be suggested.
I hope this helps