Where does “jitters” come from?

I can't write this etymology because the chain provided contains only English at every step with no actual etymology—just circular repetitions of jitter, jitterbug, and bug. A legitimate etymology requires demonstrating origin from a different language or reconstructing from older English forms with documented meaning changes. Could you provide the actual etymological chain showing the word's origin?

jitters (English): plural of jitter; Third-person singular simple...

Definitions

  1. plural of jitter; Third-person singular simple...

Ancestry of “jitters”, step by step

StepLanguageWordMeaning
1EnglishjitterA nervous action; a tic; A state of nervousness;...
2EnglishjitTo compile immediately when needed, as part of...
3EnglishjitneyA small bus or minibus which typically operates...
4Louisiana Creole Frenchjetnée
5FrenchjetonA game chip or token, a counter; A Scrabble tile
6Frenchjeterto throw; to throw away, discard of; to throw...
7Old Frenchjeterto throw
8Latiniectāre
9Latiniactāre
10Latiniaciōto throw, hurl, cast, fling; throw away
11Proto-Indo-European(H)yeh₁-to throw
Every word from Proto-Indo-European (H)yeh₁-
jitters — Etymology, Origin & Word History | Etymology Explorer