Hello, My Husband Age 54 Has Been Suffering With Thumping

Hello,

My husband age 54 has been suffering with thumping chest pain, headache in between his eyes. He's been burping from his knees. His stomach is solid and constipated one day and the next diarrhea. He a diabetic who is going in for his first colonocopy on the 31st. The 2 doctors hes' seen have not been helpful so will not go in for help as they haven't given him any lately. I'm scared about the pounding heart. He also had ringing in his ears for the last 5 years and the culmination is making his and our lives a worrisome affair... anything you could provide me would help me.... I want to help him so much but am in such a loss. Thank you for listening...