pic help

Read the input from the switch as a 1 or 0, and just keep adding it to the counter. Set it so that when the switch is closed, the input is 1 - and you count. When the switch is open, the input is 0 - you're still adding, but you're no longer incrementing. Then you can use the interrupt for your card reader.

As long as the interrupts come in on different peripherals, or you can use the interrupt on change feature which latches the changed port bits, you will have a record of all the interrupts that were active. If you want to make one of the events low priority, just set a flag that it occurred in the interrupt routine and deal with responding to it in your main loop. You can still attend to your high priority routine in the interrupt code but just put off servicing the low priority event until you have exited the interrupt. Then if required your faster or more frequent high priority event is always serviced even when you are completing the service of a lower priority event outside the interrupt routine.