It struck me as slightly odd, given that for me at least the only real collocation of tizzy is in a tizzy, and the quotation marks probably aim to convey that.
What All the "Tizzy" Is About
But I just knew this was going to be one of those "origins unknown/uncertain" words and sure enough, neither Merriam-Webster nor OED Online offer any speculation. It's recent, attested only back to 1935 according to both. (I wonder if it's older as a name or nickname and comes from there?)
But the surprise was seeing that it's used as a plural, the tizzies. MW gives a plural form, and OED has an example in the plural. So now I'm wondering if this is part of the pattern discussed here, including a broad set of disease-like plural-looking forms compiled by Ben Zimmer, such as "the glooms", "the slows" or "the uglies". That is, the extension to a plural form kind of fits a broader pattern in English.
Also a good band name.
PS: Great word play in the Onion obits this week: "Persey Hallman, 61, passed away this weekend in his sleep. He was a family man and a secret-family man."