I am having the same
symptoms.
Heartburn, back pain, lightheaded and neausea, I also had lots of belching but I do that to try and stop the neausea. I took my blood pressure and it was 146/91 and BPM was 86, my normal is about 110/66 and BPM is about 65 to 70. I had Reflux surgery 15 years ago and have not had heartburn since, until last night. Symptoms have gone away since the middle of the night. History of my family.