I've been having this burning sensation on the left side of my chest for the last three months. It's not super painful, more like an irritation, but sometimes it feels like pinpricks and can also move to my armpit and back. I've had a 2D Echo and two TMTs, and everything came back normal, but I'm still feeling this discomfort. Should I be worried about this? Do you think I should get another TMT or look into something else?

Considering your symptoms and the normal results of your previous tests, it is important to rule out acid reflux as a possible cause of your chest irritation. I recommend trying a proton pump inhibitor like Omeprazole 20mg once daily before breakfast for 4-8 weeks to see if it helps with your symptoms. Additionally, you can take antacids like Tums as needed for immediate relief. If the symptoms persist or worsen, further evaluation may be needed, but repeating the TMT may not be necessary at this point.