I know, it's hard when you start taking something and it does horrible things to your emotions.  Severus should be able to do that . . .and recognize the cuff for what it is too, if he spots it.

Thanks for your support of my Hagrid.  I have always seen him as more than just a figure of comic relief and a bumbler.  To me, he is an often underrated and ignored character and that's a shame, because think about how long he's been at the school, and what he knows about things that have gone on.  he probably knew everyone's parents from Harry's year and could tell plenty of tales.  And sometimes he might say things by mistake, but that doesn't mean he's stupid.  To me, he is a wise figure, one who watches and sees much, but says little unless asked.  And then when he does talk, he has something useful to impart, as Severus knows very well.  And he is honest and does not seek to manipulate people, like Albus so often does. 

He does see it . . .and part of Harry's problem is the side effect of the potion and the other is his mental state--stress and loneliness.

The cuff shall be noticed next chapter.  yes, it is draining him but no, the toad isn't getting any benefit from it that way.