Our expert says:
Most likely to be muscle, and muscles can get twitchy, and if they spasm or cramp even a litle, that's sore. Presumably your doctors have checked out everything that needs checking, and are confident that, however it may feel like for you, you're safe to exercise and nothing sinister is likely to happen. I also get migraines, and know how nasty they can be. Fortunately that sense of pressure is usually not sinister, and indeed isn't generally a feature of anything sinister.
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