Can acid reflux cause weakness? I have acid reflux and have been feeling so weak I have to lie down most of the time. Could acid reflux be the cause?

It's a stretch. the only way I can relate acid reflux to weakness is if you've had chronic acid reflux that has caused esophagitis, which has led to blood loss and resulting anemia, causing you some fatigue. But one would have thought that you'd notice dark, tarry stools beforehand. Have your doctor evaluate you for the possibility of anemia.