No problem
Magnesium is naturally relaxing, which makes it great for panic sufferers and overall health, but that means some people also get sleepy after taking it (like my brother, who only uses it at night for that reason). For me, it stopped making me sleepy after a couple weeks, so I'd wait it out and see if you notice improvement. You could also try taking a lower dose in the morning and using a high dose at night. Just my opinion, do what works best for you!
Hanino, the original poster for this thread, said he took the regimen daily until about the six-month mark, and then started taking it just a few times a week--but that he was "cured" before that. For me, I saw huge improvements immediately. The first day I took it, I felt a difference. By the end of the first week, I felt even better. I'd say I felt "cured" 4 months in, but I was getting better every week and could feel it.
My particular anxiety came in days-long episodes, where for 3-10 days for no reason, I'd feel constantly anxious, depressed, and panicky, and within those days I'd get panic attacks on top of it all. I also had strange physical symptoms during those days--dark urine, headaches, stuffy nose, upset stomach, fever and chills...it was ridiculous. No doctor could figure out what was wrong with me--especially since I was completely normal between the episodes, sometimes even happier than usual (which I later learned was mania).
Finally, a doctor who listened and a few good Google searches led me to the problem: I had quit Abilify (taken for compulsive hair-pulling, for only two months) cold-turkey in January 2012, when all my symptoms and anxiety started. I had never had panic attacks in my life until that. My doctor called it "pharmacologically induced bipolar and panic disorders;" another called it PAWS (post-acute withdrawal syndrome). They both mean the same thing: my brain's neurotransmitters were not working properly anymore, and were actually depleted. This is why I believe Hanino's regimen worked for me--it gave my body and brain everything it needed to restore my brain's normal function, and it also helped my hormones level out after the birth of my child in Dec. 2012, when my "episodes" became worse than ever because of postpartum depression.
So, long story short, I felt the healing happening very quickly, and about two months ago I had a mild, two-minute anxiety attack--and none since. I get occasional twinges where I feel panicky, but like I've said before I think that's like PTSD...just me remembering those old feelings, since honestly that time in my life was traumatizing in many ways.
Everyone's different, so I don't know how long it will be before you consider yourself cured if this works for you (it seems to have worked for almost all of the people on this thread!) Even if your anxiety, unlike mine which was new to me, is something you've struggled with a long time, there's still a good chance it could improve/go away very fast--Hanino and others in the thread have mentioned feeling better in a few days, and 100% around one month.
I hope the regimen works for you! Just give it a fair shot and stick with it--I was skeptical when I started but I'm SO happy I went for it!