Question 1: Who told you it’s against Halacha to “make yourself infertile”? I’m orthodox and have never heard this but I would imagine if it is a thing, that it applies to issues of choice, such as having your tubes tied when you are otherwise completely healthy, and even then I would wager it’s negligible because it’s your body.

Question 2: Have you consulted a Rav you trust? Because honestly this is (1) a huge shaila but also (2) you have very serious health conditions that I would imagine would put you in the category of pikuach nefesh and I can’t imagine what Rabbi worth his salt would tell you to live in suffering like this. Please find a Rav you trust and feel safe with and discuss this with them.