Dyble said he experienced chest pain for four days before being taken to hospital and he had no idea that his symptoms could be linked to a heart attack.
“I naively thought it was just really, really bad heartburn,” he said.
“I thought, I’ll go to work in the morning and on the way home from work, I’ll nip into to the chemist and and try to get something else to shift it.”
During a personal training session with a client, he said the pain was “horrendous” and travelled down his arm and neck, so he left work early to rest at home.
Although he still “hadn’t put two and two together”, he called 111 to describe his symptoms and an ambulance was dispatched immediately.
Dyble said it was a “surreal experience” to be driven under sirens and lights to Leeds General Infirmary, where he was rushed straight to the operating theatre.
He had emergency surgery to clear a blockage in a left ventricle artery and was later told he could have been 45 minutes away from his heart stopping entirely.
“It was a really big shock. Not just for me, but for my family and for people that knew me as well,” he said.
While in recovery, a consultant told him he had widespread coronary heart disease, which although classed as mild to moderate, needed to be managed with medication.