I definitely experienced this. I got tremors. My hands were shaking big-time. And, I couldn't sleep. It took a couple hours to wear off. I knew I had to cut back after that.
That's scary, you probably had some kind of serotonin syndrome, bacopa makes you very sensitive to serotonin.
No, it was T4, thyroid hormone. Serotonin syndrome would have other symptoms. The only symptom listed that's slightly similar is shivering, and this was not shivering. This was hand tremors, the classic symptom of too much T4.
Sure it does increase thyroid function but to say it gives you hyperthyrodoism is a bit exaggerated. (even though due to the amount you took...)
I already experienced that kind of feeling with bacopa when I took serotonergic medication : unability to sleep, hand tremors, short term memory loss, feeling jittery all the day, arrythmia etc...
When I don't take serotonergic medication this never happens, it has to be linked with serotonin.
Tremor is a typical condition of low serotonin (or call it serotonin downregulation), this causes fibrosis and ultimately death.
And yes, this is what caused peripheral neuropathy, if you experience fibrosis, fasciculations, tremors this is related to the serotonergic system.
I'm curious, where did you read that?
My experience is that the effects of Bacopa are mostly gone after only a couple hours. But then, I don't think we can be sure that bacosides are the only active component. So, I may be judging the effects of something else in it with a shorter half-life.
I read somewhere it was about 5-7 hours, I don't have the link. However I remember the first time I took it, I took it at 7AM and had extreme sleepiness/drunkness all the day until 18PM, it lasted for a long time.
Also even if the half life is not extremely long, serotonin upregulation lasts more than bacosides do and that should be considered.
There are many other components besides of bacosides however pill formulations have high concentrations of bacosides which are said to be the components that make bacopa effective and the problem behind all that is due to bacosides mostly, herbal bacopa even taken in high doses doesn't cause such symptoms as bacosides concentration is relatively low.