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This is Dr. David
you could have an infection in your knee or possibly gout infection or severe arthritis causing pain
how old are you?
you need to see a doctor at the ER or your primary care doctor to get a knee exam and an MRI scan
you might need fluid pulled out of your knee to help with diagnosis.
if you have an infection in your knee, you might need antibiotics to help clear the infection.
you could have a hiatal hernia where part of your stomach gets pushed above your diaphram which can cause worse stomach acid reflux up your esophagus.
obesity and increased abdominal girth can push the stomach organ up into the chest
let me know if you have questions.