Itunes update and library disaster

WIth most recent itunes update introducing Music, my 16000 song library which is as old as iTunes is now unusable and not accessible from my hard drive. iPods(Iknow, things of the past) are not updatable, CD downloaded music is no longer accesible on my hard drive, and iTunes will only play 4 songs (the same, and ones I dont like) at a time. Apple plays dumb. It been with the "engineers" for two weeks without resolution. This is the worst malware I have ever downloaded. Cost me thousands.

Hank