I am having a problem with my kitchen sink first the water pressure went down then the garbage disposal stopped working now then water pressure has completely stopped when faucet handle is pushed over to the cold side and the hot side is streaming out slow. Please help!

Don't think they are related. Does the water flow freely in other faucets? This is a single handle faucet, you didn't mention name, but if all other faucets flow freely, first take off the aerator and make sure it is clean. If so, you will need to turn off the water at the sink angle stop and disassemble the faucet to check for debris in the cartridge. Do you have the wrench for the disposal? Have you pushed the little red reset button on the bottom of the disposal? Is the breaker tripped-if so provided?