I Am 70 Years Old. I Got The Flu The

I am 70 years old. I got the flu the day after Christmas. I have a pain (pinch like and heavy in the middle of my chest. It is under my breastbone. It will not go away. No pain in my arms. A little difficult to breathe. I've lost about 8 pounds and now way 97 lbs. Do you think it might be my heart or my lungs. We live rurally. My husband now is in the midst of full blown flu also. He is Asthmatic and I don't want to over react or worse wait too long. Any Advice, please?