After updating my iPhone 4s (32GB) to iOS8 the other data on my phone is almost 15GB?

First, I updated my iPhone 4s (32GB) to iOS8. On my phone it said that this would require about 4GB but since my phone was about halfway full, I decided to update my software via my phone. Everything went alright and it installed correctly. I recently chose to sync my iPhone with my computer but at first it said I had to instal the newest iTunes (version 11.4). After installing this, I connected my phone and iTunes told me that it could not sync new content because my iPhone was in over capacity of 2GB. When I looked at the bar that indicated the amount and type of data that was on my phone it showed me that I had an additional 15GB of data labelled "other." When I then looked at the music on my phone, I realised I'd lost almost my entire music except for 5-6 songs that I had recently purchased via my iPhone. Looking on the data usage on my phone, it said I still have 10 GB available. I was able to then reduce my overcapacity by 1GB by deleting my iCloud account and apps I don't use anymore but I was still not able to sync. I can't restore a backup from my computer either because the last one was made when I first tried to sync and I think it won't solve the isuue.
Please help! Thank you for any comments or ideas for solving this problem.

Do you know what is the Other on your iPhone. This article tells you what is the other, and how to get rid of it. Read on: http://www.imobie.com/...iphone.htm

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