Headaches after working out.....

Hello all. I have been working out 3 times a week doing water aerobics, and I have really been getting my heart rate up there! For the last few weeks I have been getting really bad headaches that start about 15 minutes after I am done working out, and it goes away about an hour or so later. I am having my protein shake before I work out and I am getting in plenty of water. Any ideas?? Anyone else experiencing this? Thanks! Renee D

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