No, it's not a spelling error. BICH stands for Benign IntraCranial Hypertension. It's a condition that I suffer from where the pressure of the Cerebro-Spinal fluid builds up and causes pressure on my brain. This results in severe headaches, dizziness, nausea (sometimes vomiting) and extreme tiredness.
The only treatment for this is lumbar puncture to relieve the pressure. Apparently there are diuretics available…