Speaking in terms of language, it's kind of interesting that such a small group of people got to be responsible for creating all of these words, when normally it's widespread usage (being a tool for communication and all). It makes for some very specific terminology that probably wouldn't exist the same way if it had evolved from the general populous. Sort of like trucker talk.
They actually stem from chemistry. I don't agree with use of cis and trans in the context of gender, mainly because those are straight up chemistry terms and don't apply very well to biological sex and selfperceived gender. No foul intented lina, using cis outside of chemistry feels weird.
Congrats on feeling better. I don't know much about getting Hormonal Replacement Therapy outside of women having ovarian cancer, men with testicular cancer, Kallmann or Sheehan syndrome. Who do you go to in such a case...it can't be your GP, can it?
They actually actually stem from Latin, where cis- is a prefix referring to "on this side of..." in contrast to the prefix trans- "on the other side of" (see: transatlantic, transformation, etc). Both prefixes are also used in chemistry and genetics. You wouldn't argue that homosexual and heterosexual shouldn't be used in the context of sex and gender because "homogeneous and heterogeneous mixtures exist in chemistry", both stem from the Greek ἕτερος [heteros], "other, different" and ὁμός [homos], "same".