that definately sounds like a pulled muscle in your chest.
i had the same problem months ago. I went to a cardiologist as well as a urologist (because my blood pressure was elevated to 140/100) but the blood pressure had nothing to do with it, it was later diagnosed to be caused by stress and my sodium intake. anyway
i also had this problem, there would be days when I was working out at the gym and i'd bend down after a set of reps to get a drink of water and i had dropped my water and instantly snapped back upright because of the chest pain. I would reccommend you see a cardiologist just to be on the safe side, but you are probably okay, just try not to lift anything above your waist and be very careful while bending down/ getting up or sitting down.
Sounds like you have pulled you intercostal muscles in chest. I used to get hthese, usually after a bout with coughing. May not be, but you may want to ask your MD about it.