My bp is 104/65 and it has been staying like this for a few days and experiencing tightness in the center of the chest had ecg and stress test 2 mnt ago it was ok what's the cause cardio, gerd muscle?

Numbers numbers numb: The bp is fine. In light of stress test which was negative other DX may be considered. Musculoskeletal pain vs gastritis vs GERD vs anxiety...etc

HIatal hernia?: If your problem is not cardiac , you should get checked out for a hiatal hernia. See your provider and check this out. You can also try some Tums, (calcium carbonate) mylanta or medications like ranitidine or omeprazole while you are waiting.