Cloudy water is typically due to insufficient chemical treatment or an inability for your filter to remove all contaminants from your water.
As your filter removes debris from the water, it will become dirty again. If you filter plugs up quickly, and shows signs of captured debris when it is cleaned, what you are doing is working. Continue until pool is clean, filter no longer seems to pick up debris, or pressure gauge stabilizes around 12-15 GPM.
Loud grinding noises are often bearing related. You will probably need a new motor or pump. Call service.
What you are hearing is probably air and water turbulence. Bleed the air out of your filter using the bleeder on top. Check to make sure your pool water is at the appropriate level so that the skimmer is not sucking any air. This should solve the problem.
Check your home’s electrical panel. The breaker or GFI on the pool circuit may need to be reset. If the breaker trips again, check the pump to see if it is buzzing when powered on, if so, it may be able to be repaired. Call for service, or bring pump in to store for diagnosis.