
No, you weren't, don't worry. Sometimes people want to press on like, but it's so tiny they miss the thumbs up, other times they're just trolls. I personally don't read stories with that premise so I don't know any. I went on anime-planet and chose "illness" as a tag. The characters won't necessarily be terminally ill, but maybe you'll find something you'll like in that list.
https://www.anime-planet.com/manga/all?include_tags=830&exclude_tags=331,334,316,818,1238

People are just haters! Anyways, here’s some
https://www.mangago.zone/read-manga/the_time_of_the_terminally_ill_extra/
https://www.mangago.zone/read-manga/i_became_the_daughter_in_law_of_the_villain_because_i_m_terminally_ill/
https://www.mangago.zone/read-manga/i_have_no_health_bored_corona_kids_version/
https://www.mangago.zone/read-manga/the_male_lead_is_unhealthily_obsessed_with_my_health/
https://www.mangago.zone/read-manga/the_terminally_ill_villain_supports_my_broken_engagement/
https://www.mangago.zone/read-manga/how_to_survive_as_a_terminally_ill_dragon/
yesterday I asked for stories where Mc is terminally ill but no one replied and people downvoted it.
umm...was I rude? :(