1 - Be aware if you need an urgent response that BL isn't an emergency response service!
2 - We can't possibly tell you unless we know exactly what your tolerance is ("decent" could mean anything really..) and what else you have consumed today in the way of downers (alcohol and benzos mainly)
3 - If you are feeling "nice" i certainly wouldn't double your dose, going up in much smaller amounts would be a lot more sensible
4 - Have a look at the opioid conversion chart in my sig, as amapola said, to give you an idea what your hydromorphone tolerance is.
Hope that helps.. welcome to Bluelight!