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Maybe the new PICs are a bit different but for old PICs the docu says:
"When an interrupt is responded to, the GIE bit is
cleared to disable any further interrupt, the return
address is pushed onto the stack and the PC is loaded
with 0004h. Once in the Interrupt Service Routine, the
source(s) of the interrupt can be determined by polling
the interrupt flag bits. The interrupt flag bit(s) must be
cleared in software before re-enabling interrupts to
avoid recursive interrupts."
"The “return from interrupt” instruction, RETFIE, exits
the interrupt routine, as well as sets the GIE bit, which
You can't get multiple interrupt because the global interrupt enable bit is cleared.