Thanks for your question on Health Care Magic.
I can understand your concern.
Since you are smoker, possibility of GERD (
gastroesophageal reflux disease) is more.
GERD is due to laxity of gastroesophageal sphincter. Because of this the acid of the stomach tends to come up in the
esophagus and cause the symptoms of Central
chest pain, chest pressure, tightness etc.
You are also having
fibromyalgia. And for this you must be taking painkillers.
These painkillers can also cause GERD.
So avoid painkiller drugs. Quit smoking as soon as possible.
Start
proton pump inhibitors. Avoid stress and tension. Avoid hot and spicy food.
Avoid large meals, instead take frequent small meals.
Don't worry, you will be alright.
Hope I have solved your query.
Wish you good health. Thanks.