Well until I see the Jaya arc in the One Piece FUNimation dub, I still don't think that would count as suffering. If there was a particular time that Nami would suffer I would know as I would feel angry inside.
Somehow I fail to see how calling Nami crazy and a mad woman for believing in Sky Island would make her suffer. I'd say this action is due to the fact that the Bellamy pirates are jerks who choose not to believe in fairy tales. (oh boy) And as to your Zoro and Nami factor, I mean no disrespect but personally I'd go for Zoro and Tashigi. Sure they're enemies to each other now but that's because there's so little info on Tashigi that more is required.
I thought that meant all the times Nami had to suffer. The only other time i would mention about her suffering was when the Bellamy Pirates attacked Luffy and Zoro...I dont think she suffered too much throughout the series though.