I'm not truly familiar with paxil, I do know if a youth is on such meds, it's better at a very low dose. Guilt as an emotion, I don't believe is med related, but anxiety can be, as well as the lows of a depressive episode.
It's great that he's back to talkative. Sometimes, when feeling low, the smallest of slights can feel insurmountable.
Is this your counselor outside of school or in school? I think it's wonderful that your teacher is involved. Do you have an educational plan that accommodates for when you feel like you do? My friend's daughter has one to help her when she has anxiety moments.
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