Has anyone ever experienced this?!

Last night, took a dose at 6pm and tried to sleep at 9:30pm. I took a large dose because this stuff seems to be very weak; didn't feel a single thing from the dose.

Anyway, started getting restless arms, which kept me up past midnight until I went and took another small dose. I was then able to sleep. I've never experienced this before!

Today at work around 10am I started getting more withdrawal symptoms! Took a smaller than normal dose, didn't feel any effects, but symptoms went away. Took another dose (smaller than normal) at 3pm and have been fine since, though haven't felt any effects.

This seems very strange! Could the batch he super old and therefore not potent at all and have hugely diminished half-life?

Thanks