I have chest, arm and neck pain with normal ECG reading. Is this arrhythmia?

Hi doctor,

I bought an ECG watch according to the recommendation of my cardiologist. I have attached three of today's 30-second readings. To me, only one seems normal. I started being symptomatic a year and a half ago, and my state has been getting gradually worse. I have chest, arm, neck, and back pain, gastritis followed by constipation, chronic intermittent dry cough, dizziness, extreme fatigue, eye floaters, etc. I did an echocardiogram two weeks ago, which was fine, and my CAC score following a CT scan was a perfect 0 last year, with no problems whatsoever. I also had a brain and cervical MRI two weeks ago, which showed no signs of multiple sclerosis or anything else. Blood pressure seemed within normal range every time we checked. I was only diagnosed with Vitamin D deficiency (14ng/ml) that I am currently supplementing for two weeks. Cholesterol levels were normal. I will not have my doctor's opinion on these before next week, and I am quite anxious to understand what is going on. Do I suffer from some arrhythmia or tachycardia?