Well, first of all, stop driving the car. The is something wrong and by driving the car it is more than likely making the problem worse. If I was in your shoes, I jack up the car and make sure you can move that wheel. If you cannot (which I suspect you can't) your pads are rubbing all the time (thus the squeal all the time). Your rim will get hella hot when driving. Take just that wheel's calipers and pads off to see what the problem is. Look for grooves, etc.
Best wishes.
Best wishes.