Needing your inhaler every two days instead of occasionally means your breathing symptoms aren't as well controlled as before. Esiflow working each time points to an airway cause such as asthma, since your heart tests have already come back normal. Morning and evening timing can point to allergens at home, acid reflux or weather and dust changes.
Next Steps
See a lung specialist to review your inhaler plan, since using it every two days is more than ideal for long term control. A spirometry or peak flow test can confirm how well your airways are responding.
Health Tips
Go in sooner if you ever feel breathless at rest, your lips or nails look bluish, or the inhaler stops giving relief.