for past couple months i have been getting great discomfort inbetween my ribs and under my left breast.

i often think it may be my back as i have a lower back disc issue but have been told by my doctor "doubtful". he has also told me it is just indigestion. my god, if this is what indigestion is im very nervous about starting a family as it apparently quite worse. i feel like im having a heart attack now!!! i get such a swelling inbetween my ribs that it will be larger than my tummy. has anyone else had this situation? have you been told it is also indigestion??? anyone, please help. thank you