i think the feeling of "this is my time" is when you're calm and have accepted death. you realize that death isn't something to be afraid of. you've got everything planned out, and the only step left is to execute your plan.
i know you said your health is deteriorating, and that your work is piling up, but suicide is a major decision that shouldn't be rushed. the option will always be there, so don't feel as if you have to ctb as soon as possible just because you've got an opportunity.
i hope this helped, or at the very least, made sense.