Mail not showing accounts after ios 7 update on iPhone 5

Question

After the ios 7 update to my iPhone 5 mail does not show my accounts. Specifically there is nothing below the word Accounts. The rest is working fine and still connected to my three accounts. However it no longer shows accounts.

Answer 1

thanks for the suggestions, i tried the ideas you suggested but i dont even get a camera showing for the rear camera, i also noticed the torchlight no longer works.  i did all the steps but no luck.
So I took my camera to the genius bar this weekend as well as walking through various steps with the apple guys in ohio support over the net. 
With the guys at the genius bar, after i insisted that it must be software as the rear camera stopped working only after the softwre update, they continued to assure me it was hardware and talked me into letting them replace the camera,  they then took it to the back and tried fixing a camera and 30 minutes later came out and said the rear camera is no longer being detected and wanted me to replace the motherboard for yet more money.  im glad they didnt charge me for the new camera though as it still didnt work.
anyway the motherboard idea i rejected as it was just 2 months out of warranty and had only stopped working the day after the release of 7.0.2, so im going to wait until the next few releases to see what happens, as i dont believe for a second its hardware.  i expected a stock answer from apple and its exactly what i got even after my explanation of how it was working the day before the release.  not overly impressed with the whole process.
i wanted to back down to 7.0.1 to confirm the camera still works but they said no chance so i cant even see if it still works ouside 7.0.2.  anyway will update if i get any further progress.