Crowd control categories and diminishing returns

[NessaWyvern]

It's the worst when I get slept 3 times, then stunned 3 times, then silenced and knockback when I just want to heal the other guy that's being focus'd down! ;-; Then I get called a bad healer because I spent much of the match unable to do anything. Purify has a long cooldown and it can only remove one of these, and I usually use it on the full swing or I am toast.