When you load up on gaba and it can actually convert into glutamate and cause excitotoxicty which is probably the reason why you felt had those symptoms when gaba is working it doesn't cause those symptoms. Also taurine is high in sulfur and this excess sulfite cause glutamate issues too.
"High taurine may affect body temperature. High taurine, along with high levels of alanine and serine, have been implicated in lowering body temperature. The mechanism by which this temperature lowering effect occurs is not well defined. Theories put forth include the inhibitory impact of high taurine on the hypothalamus, on inhibitory properties that may play a positive role in seizure regulation, or because high taurine may inhibit GABA transport. It is also possible that hydrogen sulfide, which is generated from high taurine, is the pathway by which it lowers body temperature. High levels of taurine can put pressure on the remainder of the transulfuration pathway, creating a need for Molybdenum and B12 in order to process toxic sulfur groups. "
From Dr Amy Yasko https://feelgoodbiochem.com/chapter-5/