Why when I rev my car in drive, it doesn't accelerate?

Honda Accord 2008 sedan LX 2.4L 199k miles automatic transmission. I was accelerating pretty fast and I was reaching 4000 rpm when my car made a huge sound and shaked, I thought I hit something, then my engine made a huge sound when I put it in park so I turned off the car. I turned it back on, it started, when I put it in drive it made a loud sound for half a second, again I pressed the gas and it reved but didnt move, but the speedometer was going to 40-50mph but the car wasn't moving. I put it in park and it makes a huge loud continuous sound, so I turned off the car. I put it in neutral to roll it. Then I put it in park and the car still rolls! I had it towed to a transmission shop but I want to know what it could be now! I'm in highschool currently a senior and I can't concentrate right now because I need to know what is wrong with my car! Please help!

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