Vitamin B12 Deficiency
If you are not absorbing enough B12, then you will have a deficiency, and having memory problems is one symptom of it. You also will be very fatigued and feeling malaise. Those that have Crohn’s disease or celiac disease are known to not absorb the vitamin and if you use antacids, then that can also cause the deficiency. In order to determine if you have this condition, you need bloodwork done.