Sick car

Yesterday my started grinded 2x's when I tried to start it. Then it started, but today there is a loud roaring sound when I step on the gas coming from under my dash board area. And there was a terrible odor, almost like an sweet eletrical burning odor. Also when I step on the gas to go, I have to apply more gas then I previously did. Like less pick up. There smell seems to occur when ever I start the car, and when I stop for a light. What could this be? Oh one more or I should say 2 more things, for quite awhile now there is a squeeling coming from the fan belt and air belt area, but it is not bad belts. It seems to be coming from the wheel itself that turns the belts. I have applied proper spray for slipping belts that quiets it down for only a few welcomed seconds (it is sooo annoying). But it starts a chirping real soon after again. Also my gas mileage is so poor.I have had my gas filter changed which help slightly. On a full tank, I average 205 to 210 miles. My vehicle is a 2006 Ford tarus, thank you Joan.P.S. I have had a tune up with new wires and plugs about a year ago. New battery and rebuilt alternator about 6 months ago