First thing you need to do is get to a place of peace and calm! it may very well be time for your rabbit to leave. Animals do not have the same fear of death, they understand it's a fine way out of a pain-ridden body and that their spirit will go on. So find peace over this matter and then you may be able to sense whether or not your rabbit is ready to leave. 99% of the time, euthenasia for pets IS done with right timing. It's only when they are stuck in kill-shelters that the timing is inappropriate. Caregivers tend to do the right thing at the right time, if they are not swayed by fear.