My husband has recently had a meningioma(brain tumor) removed. Everything is going good with that but the past week he has experiencing dizzinesss, stomach burning, and feeling VERY weak...NO energy whatsoever. He has been to his doctor, they took blood, urine sample. They sent home a stool sample for him to get and drop it off Monday morning. He even went to the local emergency room...they took an ekg of his heart, ct scan of his head, blood and urine samples...they could find nothing wrong with him. Could you possibly tell me what is wrong with him? Could it be an ulcer?