.Sorry I didnt get a chance to advise you beforehand. I know what a sickening feeling it is to crash in the house and pick up a wrecked drone...been there with two drone crashes to show for it. Its not a sign of ignorance on your part. The drone is designed to fly indoors, but I dare not again unless it in a huge building.
With the rattling in the controller it sounds like a warranty claim. If and when you send DJI your remote and drone, they will be able to discern precisely what occurred via the black box info, so be sure your description of the incident is accurate. In other words (and please don't assume implication on my part here) they can differentiate between a power on crash, or one dropped out a second story window (just to illustrate my point)
I had DJI refresh express, as opposed to DJI Refresh, ask customer service the difference. However, if you just bought the drone you can go on line and purchase DJI Refresh. The cost (I think) is $135 to sign up. You are allowed two crash cases in a one year period but they also cost. Its $85 for the firs case and $135 for the second. The total out of pocket is therefore is $355 if you use both cases.The controller can be sent as well but as I said, the whole incident sounds like it should be warranted.
If you use the refresh option, DON'T ship it yourself. Wait on the DJI shipper that will arrive via email. Take out the battery and take a picture of your serial number. Remove the props and battery off the drone. Along with the shipper you will receive a case number as well as a form to fill out on which you give information about your drone; don't lose the case number and make a copy of the form before packing it with the drone.
once its shipped sit back and wait at least two weeks, they are processing thousands of repairs weekly so its a waiting game, Use the time to read up and get yourself ready for the next flight.
Also, take Lake_Flyer's advice and stay outside in an open area. I've crashed outside as well getting in too close proximity to trees. If I recall, I had three prop strikes outside due in part to the forward sensor no picking up small branches, and of course, pilot error, which is 99.9% of all crashes.
As for the antenna, it sounds like the ends that hold the antenna into place may have cracked off. You can try pushing the antenna in at the base to see if it "snaps" into place, being careful not to rotate it towards. In other words, if your controller is lying face up on a horizontal surface such as your kitchen table, and the antenna are pointing towards the ceiling, the right antenna shouldn't be able to rotate right, nor should the left rotate left. There is a notch that, once they are "snapped" into place, safeguards against 360 degree rotation, which would damage the coax cable inside.
That brings up another point. When flying, always have the long side of the antenna (back or front) pointing towards the drone as opposed to the tips. For example, when the drone is directly overhear, you'll need to extend the antenna forward.
I've got a complete controller dissembled if you would like to see the inner components, I can send you pic/s.
Hope this helps some