Welcome to Connect, @samb33. I can imagine your worry because there's so much emotional stress with having symptoms that nobody can explain!
I wanted to quickly mention that I’m not a medical expert, hence I wouldn’t be able to advise you. However, since the most important ingredient of Connect is its members––like you––I’d be glad to tell you what I’ve learnt from all the shared experiences and insights.

Chest pain is one of those things that can be quite challenging to diagnose––and you want to consider it seriously as this type of pain can be a sign of heart disease. Chest pain generally originates from one of the organs in the chest (heart, lung, or esophagus) or from the components of the chest wall (skin, muscle, or bone). Organs close to the chest, such as the gall bladder or stomach, may also cause chest pain. Pain in the chest may also be the result of neck or shoulder joint pain that is referred to the chest, called referred pain. Take a look at this article, which explains the possible causes of chest pain: https://www.uptodate.com/contents/chest-pain-beyond-the-basics

@samb33, have had any tests to rule out heart-related issues?