The Cairo Pulse by B. B. Kindred

"An absolute page-turner with a brilliant idea at its heart." Manchester architect Gabriel Meredith is plagued by a mysterious brain condition. Conventional medicine seems unable to find a cure and as a last resort, he agrees to be treated by experimental neuroscientist, Cairo Shore. When unprecedented brain activity is revealed, an event cascade is unleashed that questions the very nature of reality. Gabriel is forced to confront the secret he's been hiding from himself, only to find it's the tip of the iceberg. Can the cosmic conundrum be solved before it's too late?