I'm going to call an ambulance
Are you having an emergency for you to call EMT?
This service is for me, because I have a broken heart due to a sad event
This is not going to sit well with the EMT's, you will be wasting their precious time. They need to be on another call helping a person with a more deadly disease or accident instead but you are calling them for your heart being broken which can be painful cannot be fixed by the EMTs. You should maybe try talking to someone about your problems instead.
I might get tired of waiting for an ambulance, so I'll call a taxi.
Taxi's are cheaper. You don't want that ambulance ride bill, trust me! But you will be better of not going to the hospital to treat that anyways. You will just have to spend a lot of time there to find out that they cannot treat you for your broken heart.