I think anything that affects your body's ability to absorb nutrients could cause this type of vitamin deficiency - so can severe diarrhea, so the bout of dysentery you had could have triggered it. I'm not sure why your doctor would want you to discontinue your seizure meds, but he may be wanting to do diagnostic tests that require you to be off your AEDs to get an accurate result - I've had a couple of tests that were like that. He might also be concerned about the possibility of paradoxical seizures caused by the meds themselves. But whatever he's thinking, he needs to be discussing it with your directly rather than with your other doctors. Is there any way you can set up a meeting with him and your other doctors to develop a better approach to managing your seizures?