I've been feeling this odd sensation in my chest for the past 23 days, almost like there's a light weight sitting there. When I stand up after sitting for a bit, it gets worse, and I feel a bit breathless with fear running through my mind. What could be causing this, and who should I see about it? It's pretty scary for me, especially since I just had tests like an ECG done last year for insurance. What do you think?

I understand that this feeling can be quite distressing. It could be related to anxiety, acid reflux, or even a cardiac issue, though your previous tests were normal. I recommend consulting a cardiologist for a thorough check-up and possibly an updated ECG, as well as discussing any anxiety or stress you might be experiencing. Take care!