Shortness of Breath/Sharp Pain in Chest?

For the last few months, I have been having constant shortness of breath all day and night also had chest pains. I went to the doctor got a lung function test done, and an EKG done. The doctor said my heart is fine and there is nothing wrong with me. I got these tests done about a month ago. I still have the shortness of breath symptom, and have quit exercising because when i do some kind of exercise i feel i can't my breath and feel like i can't take a deep full breath. Sometimes i get sudden sharp pain in the left side of my chest which feels like it is my heart that is getting this sharp sudden pain, which makes me scared and i stop doing whatever i am doing. I get scared when that happens it has happened a few times now within the last 2 months and that is why i had gotten the EKG done. The doctors say nothing is wrong with my heart and nothing is wrong with my lungs. I have no idea why this happens but i am upset about why i can't exercise anymore, whenever i exercise i just dont feel that great too do it, because of the constant shortness of breath i have. I also have a tight throat, whenever i swallow it hurts from the outside of the throat, like its the throat muscles not a sore throat, which makes me not eat at times. What should i do, go to a cardiologist? Please Help??