Documents and Data taking up all storage on iPhone
A few days ago, I tried to send an email with a large attachment. However, it wasn't sending so I deleted my email account from my iPhone. After I did this, I got a message saying that almost all of my storage was used up. I checked to see and I only had about 5gb available from 64gb. I plugged my iPhone to my computer to check what was taking up all this space and 45gb of my space is being taken up by Documents and Data. I have deleted old messages, imported pictures to my computer and deleted them, clearing my history on safari, logging out of iCloud, and deleting most of my apps as I have read that deleting apps and later re-downloading them helps. I also updated to iOS 9.3. This helped very little. Documents and Data is now taking up only 43gb instead of 45gb. Before this happened, I had about 50gb free and now I have just 5gb free after this happened.
What else can I do to clear more of the Documents and Data? Should I restore my iPhone to one of the backups that I have saved? Should I take my iPhone to the Apple Store since it happened so suddenly and randomly?