Every night my heart rate comes up a little up to 85bpm. Normal heart after EKG echo stress test. Dr says it can be acid reflux or anxiety every night?

Not abnormal. This is not an abnormal heart rate. When you say at night I assume you mean when you lie down to go to sleep. I suspect it is related to psychological issues and is not a sign of a heart condition. Your heart is responding to the messages it is receiving from you mind and body as it should.