Whenever you go to the ER, their job is to stabilize you. Not so much care for a chronic situation. That's what regular doctors are for. I'd first call your gp or regular doctor with this report and ask next steps. Chest pain is very worrisome. ER's get people with this going on frequently and are trained to look for dangerous situations. https://my.clevelandclinic.org/health/diagnostics/22770-troponin-test This site says that for either types of troponin, you are outside the normal range. What is unknown is if low meant that your lower than where they see it as an emergency. That I don't know. I'm am sure they told you to consult your doctor or a cardiologist?
The normal range for troponin I is between 0 and 0.04 ng/mL but for high-sensitivity cardiac troponin (hs-cTn) normal values are below 14ng/L. Other types of heart injury may cause a rise in troponin levels. These include: Atrial fibrillation.
I would certainly talk to the GP regarding this and get his opinion.
From what I have read, you should see a heart specialist as soon as possible.