Which Gedolei Poskim are generally reachable for very serious or grave shailos (like pekuach nefesh or other issues)
Why are you leapfrogging over your own Rav?
If you feel that your Rav is incapable of answering these questions AND unwilling to admit that he is not knowledgeable enough and is not willing to go to (or refer you to) a greater Rav, then you need a new Rav.
However, you should be starting with your own Rav — not skipping by him.
The Wolf