Haha, if we lose the technology we've invented over the past 1000 years, in a matter of weeks perhaps 6 billion people will die.
There won't be food for anyone.
Second to that, there won't be any protection from disease (no medicine = no diabetics, many types of disabled people etc. as well as no protection from common illnesses such as antibiotics for fevers). Additionally, of course there won't be electricity. Government's will collapse because the current people will have no need for a government that cannot feed or even accomodate its people.
The world would be in sheer anarchy and many many will die.
But many will survive and rebuild society back up.