Hello @marifersitacastro,

I found on the Carcinoid Organization's website some information in Spanish which perhaps helps you in understanding this rare disorder.
https://www.carcinoid.org/for-patients/general-information/un-analisis-del-cancer-carcinoide/
While I've never experienced carcinoid syndrome personally, I have heard that there are "rescue" shots that can be taken in between monthly injections which are helpful.