Welcome to the Migraine and Headaches Forum! This forum is for questions and support regarding migraine and headache issues such as: abdominal
migraines, headaches caused by allergies, cluster headaches,
headaches, headaches in children, migraine headaches, sinus headaches, tension headaches, visual disturbances.
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If eating a banana helped then the nausea could be due to low blood sugar or acidity. This can cause headache too. I do not think this is related to brain tumors. If the symptoms reappear get your blood glucose checked. You can also take OTC omeprazole meanwhile. Along with it you can try over the counter antacids. Avoid heavy meals. Avoid too much of caffeine, tea, fried food and drinks both alcoholic and non alcoholic fuzzy ones. Avoid heavy exercises within 4 hours of a heavy meal. Raise the head end of the bed by pillows to 30 degrees. Go to bed at least 2 hours after food.
Hope this helps. Please let me know if there is any thing else and do keep me posted. Take care!