Transmission Fluid Leaking problems of the 2004 Cadillac SRX

I bought the Srx used in September and since then I have had one issue after another. If I accelerate too quickly my transmission, (I think), has a very loud ratcheting/popping sound. My service suspension system error msg comes on every time I start my vehicle. I have read that this could be related to the air compressor not working or faulty sensors. My service stability system error msg also comes on every time I start my vehicle. This seems to cause the traction control feature to mess up, which then on occasion when I press my brakes, even slightly, my brakes lock up and I skid for just a second. My power steering fluid seems to continually leak or the pump is bad. I have refilled my resovoir many times and I constantly have a very loud "whining" sound. My power steering system also seems to go out occasionally and my vehicle is very difficult to turn.