During the January lockdown, Marilyn Law thought she was doing the right thing in using her new exercise bike to keep fit while gyms were shut.
Marilyn, a keen walker who previously had attended a weekly exercise class, furiously pedalled away for 40 minutes four or five days a week often building up quite a sweat.
But within two weeks of starting her new regimen, Marilyn developed blinding headaches. The excruciating pain centred on one eye and would come on without warning, often in the middle of the night. The throbbing started in the early hours of the morning, says Marilyn, 75, a retired caterer and mother of two, who lives in Bury, Greater Manchester, with her husband Robert, also 75, a retired driving instructor.
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