Music deleted and I can't re-downloading

I've bought a lot of new music recently, and after a week or so, all the new music deleted itself and whenever I try to download it is tells me "This device is already associated with an Apple ID" and tells me I have to wait 10 days. I've only used one Apple ID for all my purchases as well. Also, a big problem now, is whenever I try to download more music, the message appears again, telling me that I have to wait and stuff. Please help! Thank you!