Wifi Greyed out after upgrade to iOS 6 on iPhone 4s

Hi, I upgraded to iOS 6 two days ago, and I have the following problems:

1. wifi is greyed out therefore I cant connect to wifi whatsoever

2. Bluetooth hang- i.e. the thinking wheel continuously rotate and does not recognise other devices on bluetooth

3. apps shut down unexpectedly, some refuse to open

4. battery gets really hot and drains quickly

I have done everything that everyone in this forum suggested: network reset, hard reset, setup as new, etc etc. but NOTHING WORKS!

I'm left with my last option which is to bring it back to the Apple Store. However, I am currently in Jakarta, Indonesia, and there is no Apple hardware support or Apple Genius Bar. So if anyone out there has any idea what I can do to get my phone fix without the need to travel to another country.. I'd really appreciate it.

Cheers