The drug of choice for strokes with heart patients, particularly with dysrhythmias, is apixaban or xarelto. Aspirin is too limited in that function. If you have flutter, you should probably/certainly be on apixaban.

An ER can stabilize you, improve your condition, delay heart failure due to rapid heartbeat, ...........AND....get ahold of a decent cardiologist or electrophysiologist and have you treated asap. Your flutter is not a good thing to have. A friend of mine was ablated inside of ten days once they knew he had flutter. Why the urgency? Because neither he, nor the diagnosis/admitting EP, knew how long he had been in flutter. If it were weeks, they needed to treat it urgently.