Iron level 9, diagnosed with anemia. i have a rapid heart rate that goes to 180 when walking at a 3mph on the treadmill, is this part of my anemia?

Perhaps partially: While anemia can cause some level of tachycardia (fast heart beat), 180 is very rapid, and i would suggest further evaluation by a cardiologist if your heart rate is anywhere near this fast while at rest. If you just started exercising, this heart rate doesn't stay this elevated long and your heart is not used to this level of activity, it should start to decrease as you maintain regular exercise.