so a soft reset (ie. Power + Home) and then when the phone restarts, run the native weather app. you'll be back to normal but make sure location service for weather is turned on.

For now Health app can just measure your steps taken and walking/running distance (data taken from M7 co-processor I guess)
I hope apps like Jawbone Up and Strava can integrate their data into Health app, I use this 2 apps often.
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24%? That's quite high. My Jawbone app just used 8% as of now, but I think that is because it just use bluetooth to sync data from the band, not using the M7.
Yet to try Strava or Nike Running on iOS8. Will try it out later and see the battery usage.

I have a question regarding instant hotspot between one iphone to another:

It is buggy to say the least, with the phone sometimes showing up in the wifi screen, sometimes not.

Does instant hotspot give the ability to reconnect automatically after disconnecting? Say I don't use the iPhone for half and hour, and then when I turn it on, it does not automatically reconnect to the other iphone hotspot. My understanding is that the usage of bluetooth should enable this function. What I now have to do all the time is go to the wifi screen and select the hotspot again.

Any advice or experience on this matter from anyone is greatly appreciated.