What makes you want to go into EMS? If you are are doing it as a passion type thing (volunteering at you local FD, getting skills before doing humanitarian missions) it is a great way to think and skill set to have, if you are bored of the ED and doing it as a change of pace I think that you will find it less satisfying and more frustrating than you would expect.
I went from being a Firefighter/EMT to ED nursing and wouldn't go back. I do volunteer at a pediatric cancer camp as the critical care nurse (we provide ALS care and will ride in as the ALS provider).
In EMS you will have a very limited scope of practice with a lot of responsibility. EMS does not have independent practice, if you have a negative outcome you can be scrutinized to a very long and impractical set of protocols. Even outside of the protocols you are rarely independent, often a supervisor or fire officer will try to tell you what to do often in a way that does not actually benefit the system or your patient.
Depending on the system you may or may not have a station, but even then you will often stage in the middle of nowhere for hours with little to do. You and your partner are often the only medical providers on scene. You have to assess and treat the patient yourself with very limited resources even in the most critical of situations.
I have the utmost respect for our EMS providers, but there is a reason that they leave for another field at a very high rate. You don't really see EMS field providers with decades of experience. They tend to either go to PA or Nursing school
, or go into management where they are no longer working in a patient care environment (or are lucky enough to get onto a metropolitan fire department that actually pays decently).