Can all of my main symptoms be caused by allergy? **Main symptoms** - Fatigue and brainfog that comes and goes, can stay for weeks/months. - Constant stiff and painful neck pain for months, usually when in a stagnant position standing still, looking straight forward. - Bradycardia and random arrythmias for 3-5 seconds, usually when lying down on the side. - Shortness of breath occasionally, often in the morning - Blurry vision and light sensitivity at times, usually at night time. - Intolerance