Yes swimming caused head pressure, and this led to 2 to 3 days of migraines, severe light and noise sensitivity and chronic fatigue. I am delighted that I can now do 20 lengths straight after being in the gym for 30 mins. I wouldn't contemplate running or jogging yet, but might increase the walking speed on the treadmill in a few days time. Caution is the order of the day and if I get any significant head pressure I will stop exercising. Hopefully in time I might get running again, I went on the bike and crosstrainer at some pace, so that's promising. Still only have a mild headache this evening as well!