Hi ghemant!
Welcome to the forum!
I hope the damages are so far less! Plenty more to come so be prepared! (Note : it's better to fail now rather to fail on an important day.)
Jokes aside!
Safety note: while working with multirotors or any aircraft Please remove your props when you're not flying and doing something on the airframe!
Check for the following!
1) recheck if you've selected the correct hexacopter frame type
2) recheck your ESC to pixhawk connections
The above two if done wrong will result in sway in one direction and topple.
3) redo your ESC calibrations on the pixhawk. ( Remove props and do)
4) check that the radio is properly calibrated on the mission planner and also if you give any stick inputs then the slider should also move in that direction on the radio calibration page.
The above two points should take care of no control issue!
One last thing is always before updating the pixhawk firmware,use only stable firmwares!
Do check this link
https://ardupilot.org/copter/If you follow it you should have a well working hexacopter!
Personal advice/experience: Don't take any short cuts or rush things with multirotors and pixhawk, things get ugly really fast!