Question for the scientists/doctors out there.

Any advice on what we people that don't have thyroids (or malfunctioning ones) do if we run out of levothyroxine (supply chain issues).

I've searched & searched online to no avail for natural substitutes, i.e. pig hormones (still need a prescription) etc. and can't find anything I can stockpile.

My doctor will will not let me get an extra prescription to set aside in case of emergency which I think is BS considering I'm stable with my daily dose (I'm not the local drug dealer, but maybe I should make friends with one huh?).

Biology isn't my strong point, are there any knowledgeable people online that could advise anon.?

In a hypothetical life/death situation (before falling into coma from lack of hormones) are there any natural (beside pig hormones) substitutes? Or any other animal thyroid glands that could be used to produce something that would at least keep you alive for awhile.

Any help appreciated, and thanks for all replies.