Well...I've just had to cancel a Norwegian cruise I was going to start tomorrow, my 3rd ever foreign holiday as an adult, first holiday in 7 years, because an autoimmune disease that has been laying low for a year or so has flared up again. I have a platelet count of 4 so the hospital very strongly advised me not to go lest I spontaneously start bleeding profusely from every orifice and internal organ or exsanguinate from a papercut or brushing my teeth. FFS.
That seems to have been written in an ascending order of severity. I mean, I'm sorry you're going to miss your cruise, but the complaint really should have started with the flare up of an illness that might have you "bleeding profusely from every orifice and internal organ."
Seriously though, I hope you get through this; it sounds really terrible. There will always be other cruises, but avoiding "bleeding profusely from every orifice and internal organ" should be your focus and #1 priority, my friend.