I just upgraded my iphone 4 to ios 6 and its running really slowly now. Please help

Also my proximity sensor has stopped functioning. Any idea what could be the problem?

Perhaps you should check. Then maybe you should follow standard troubleshooting protocols before asking for help...
reboot the phone.
Restore the phone.
Restore the phone as a new device.
If you're having problems with the proximity sensor, remove any case or screen saver you have installed. They can interfere with the sensor.

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