Itunes on macos 10.14 and IOS 13 Device

My iPhone is updated to the lasted IOS 13 beta 2 software update, but since I was having so many issues with the MacOS 10.15 I erased my hard drive and loaded my backup drive back onto my MacBook. During the process of me using MacOS 10.15, all my downloaded music disappeared, and I was able to get them all back on iTunes with my backup on 10.14 mac software. but not my laptop no longer reads my iPhone. Every time I try to sync my iPhone using iTunes the battery noise just keeps going on and off and I am not even able to get stable connections to sync my device. The times iTunes is able to read my device it tells me an update needs to be downloaded for my phone and when I click on the download button to have the update nothing happens. Now I am stuck without my music and no way to load it on to my device. *PS* I do not have an apple music subscription so I cannot download through Icloud. *