When a non-count noun takes a plural form, it becomes a countable
noun. You have to decide whether you are speaking of the
non-countable condition/quality/amount, or of multiple instances of the
same. For example, I can have many
feelings during a baseball game-- elation, depression, hope, despair,etc.-- or I can decide that
feeling is inappropriate for a spectator sport and I can go place a bet with my bookie.
Does this help?