While I have never been hit, I had a diver in my group get DCS while on a trip to Belize. She and her boyfriend got there 2 days early and had completed 6 dives. The first night we were there at dinner, I noticed she acted like she had no appetite, and lethargic (not at all like her). She was quiet, and mentioned she had a headache. I asked her to speak with me privately, and learned of her dives. She was slightly unsteady and did not feel well. I asked her to take my hands and squeeze, as she did I noticed she had half the strength in her left hand. I knew there was a chamber on the island, but at 9:00 it was not easy finding the only doctor. When I did find him, he came to the hotel and quickly diagnosed her with DCS. She spent the next 4 days doing multiple hours of treatment. After each treatment he would examine her, and teaching me what he was looking for. Coordination, how her eyes moved, attitude...these and other things I had never been taught, were observed to improve after each treatment. Was was fine, but no more diving on the trip.