Thanks for your question on Health Care Magic. 
I can understand your concern. 
In my opinion, you are mostly having GERD (
gastroesophageal reflux disease). 
It 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 lower central 
chest pain, 
chest tightness, pressure, heaviness, gaseous distention of stomach etc. 
So take 
proton pump inhibitors and prokinetic drugs. 
Avoid hot and spicy food. Avoid junk food. Avoid large meals, instead take frequent small meals. 
Avoid stress and tension. Be relax and calm. 
Don't worry, you will be alright. 
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.