Okay, there was very little evidence on screen that such a thing was happening.
Again I disagree.
Chakotay, Tuvok, Seven, etc. all offered up advice and aid to him. Nobody ignored him but people lives & responsabilities don't stop either. Counciling can only do so much, the only one that can save you is you. Neelix had to come to his own conclusions himself. He had to want to get better. What helped was finding a new purpose in life.