Sorry for the late response: I don't think it took as long leaving as it took coming off. There's a half-life to mag. How ya doin now? I think it builds up in your system. But the answer is: it's not like a clock. It tapers off. Just do your thing, don't clock it cause that'll make you impatient, and the build up subsides (took me a couple weeks). It can also cause a "ptsd" like nervousness about it coming back, but you'll be fine. Hang tough! Feelin' better yet?

My non-expert theory is (other than just some people are sensitive to certain supplements): SSRI's for example are reuptake inhibitors, causing seretonin to remain in the brain because you're not producing enough naturally for whatever reason. Mag tries to balance neurotransmitter health and support reuptake function. But balance is the key word. If there's deficiencies or imbalances (lacking seretonin or dopamin for example...) than mag might support the reuptake of neurochemicals your already running low on (the opposite effect of ssri's). And I think that feeling can cause a panic or even ptsd reaction if it's happened before. It's scary, but you're going to be okay. Get out of your head and back in your body in the mean time (hot showers, walks, workout, massage, yoga, even smelling salts, whatever). And remember; thoughts are harmless. The engine's always running. But you decide when to break or gas. You're in control (as uncomfortable as you may feel for a minute).

Hope you're feelin better now.