the fastest way would be to apply with an agency that does this sort of service,if you could afford it?
do remember it is vacation time, so processing will be long in most country .
the processing time depends on your country of origin also.
so? try any of them, but do know that you will have to enter the country that gave you the visa first .
contact any embassy from the schengen zone that is located in the UAE.
You are SUPPOSED TO apply to the country's embassy to which you will be spending most of your time in.