doctor ran many tests at hospital and said that he did not see anything

[concerned]

wrong, anyone have suggestions? near the end of july i started to have a heavy feeling in my chest (feels like someone is sitting on my chest) i also get dizzy sometimes, my hands and feet sweat and sometimes tingle, my eyelids feel heavy, sometimes feels hard to swallow and my stomach gets upset. i was worried because some of the pain was near my heart and even just touching my sternum area is very uncomfortable and painful. i went to the hospital told the doctor all of my symptoms and was there for seven hours getting all kinds of tests done. i was given a breathing test, ekg/ecg, chest x-ray, multiple vials of blood were taken (5 or 6) lab/chemistry and lab/hematology. after all of the time i was there, the doctor said he could see nothing wrong. these symptoms lasted for 2-3 days then went away. now about a month later they are coming back, and im really starting to worry what could be wrong with me because even though the doctor said he could not find anything wrong im really just feeling that im not right. anyone have any ideas or suggestions? i would greatly appreciate it