Since you seem to be offline, ill leave a response here which we can discuss later on.
Now the pain which you are experiencing does not seem to be associated with the heart as that usually doesnt worsen on deep breathing. Pain which worsens on breathing is usually either associated with the chest wall/ribs or the lungs. The first thing which i would like to exclude in your case would be a proble associated with the ribs. Acute inflammation of the cartilages of the ribs can lead to the sort of pain which you are describing, this is known as costochondritis. This can cause pain and tenderness in a particular location in the chest and would worsen on deep breaths. This an be diagnosed easily with the help of a simple clinical examination and then treated with OTC anti inflammatory medications like motrin or aleve. Another cause of the pain can be a severe muscle spasm which can persist for several weeks in some cases, if so this can be treated with the help of increased water intake, use of electrolyte rich fluids like gatorade as well as motrin or aleve. in some cases prescription strength muscle relaxants are needed.
Now while the heart is less likely it should be excluded with the help of a EKG and echocardiogram , the reason being chest pain of any sort above the age of 52 should be considered as cardiac in origin until proven otherwise. This is less likely to be heart pain but it should be excluded with the above tests.
Now it is also possible that you have an inflammaed pleura. Pleura is the thin covering of the lung and it can be inflammed due to various reasons. The commonest one being a simple viral infection and it would cause pain which worsens on breathing. Usually it can also cause cough but it is not necessary. this is known as pleurisy. The diagnosis is easily made with a clinical examination and a simple chest xray. The treatment is with steroids among other drugs.
Now i would suggest that you use the anti inflammatory meds but DO see your doctor for a EKG and a clinical examination for a final diagnosis.
Do you have any more questions?
Please leave a POSITIVE rating by clicking on the stars above, until you do i am not compensated for my time. You can continue to ask follow-up questions even after the POSITIVE rating. You can also ask questions from me directly by going on the link below,