Thank you for your answers.
I wanted to clarify that using noInterrupts(), code, Interrupts() actually WORKS for my receiver signal, but messes up my PWM command to the servos.
I want to find a way to read my input without messing the other stuff up (maybe use another timer and do something similar to pulseIn() ?? ).
I'm looking for ideas online, but I haven't found anything useful yet... I refuse to believe that I'm the only one who's trying to make an RC device using Arduino.