Can be possible as the 2nd dose of the vaccine was due and I see that your colleague is on medicines for Hypertension ( BP ) & Epilepsy so better to take a proper Medical Consultation , doctor will monitor his vitals like BP , blood oxygen saturation etc and might ask for an Chest X ray.
Next Steps
Take Medical Consultation preferably with a MD Medicine
Health Tips
Steam Inhalation
Home Quarantine
Strict Compliance to Medicines that are already going on.