Should I use chuchers if I sprained my ankle. It has swelling and bruising and can't handle much weight?

You should be sure- -you are under the care of an orthopedic surgeon. Sprained ankles come in many variables. Could have grade 1-2 or 3.1 is minor,2 is more serious & 3 is a complete tear of ligaments. Also subtle fractions may be present as well as mortise ligaments which are very important.
Yes. you better use crutches to lift the weight off your sprained ankle, and you should see your doctor, good luck.