Check your lower main gear. This gear connects to the upper blades an is usually damaged when you perform acrobatic contact with a solid object. The gear may look fine but even the slightest pull on a tooth will make the gear catch when it contacts the pinion gear, this will cause the heli to jerk, and at high speed it will vibrate. I also suggest you upgrade your blades to the kind with blade holders, the stock set-up is bogus. The stock blades won't give when they strike, they just break and e-flight sells you another set. As for the broken body, don't replace it till you can land softly. Tape it up and fly again. If you replace it whenever it breaks, you'll be wasting a lot of cash before you learn to fly good enough to really enjoy this hobby.
I've had my CX2 for six months and nearly gave up more than once. Now I can control it pretty good instead of just keeping it in the air and away from things. I've invested quite a bit of cash on repairs and i'm beginning to enjoy it more now that I can actually control it.
Don't ever concede to failure, then you've lost your money. Stick in there till you learn to control and then you've "invested" your money.