Has anyone else ever had a reaction to magnesium like this?

So I’m very new to the supplement world, I ended up here because I’m sick of prescriptions and OTC meds that do more harm than good.

I just started using L-Theanine before bed for sleep, and I do really like how it sort of “shuts off” my brain before bed and gets rid of the noise. However, what I’m missing is the body relaxation that I formally got from using THC. Due to certain factors in life, THC isn’t an option anymore, and that’s fine. In my research one of the best things I’ve found for that real “relaxed” feeling is magnesium glycinate, which is where my issue is.

About 2 years ago my doctor suggested magnesium for sleep. The specific one he suggested was the Spring Valley brand as that’s what he took. It shows to be a “magnesium glycinate & oxide blend” or something to that effect.

I started off taking one capsule for about five days and then moved to two capsules. For the first week or two I really did notice a difference, I felt more relaxed when I was going to bed, and I could actually feel my entire body relax as well. That is exactly what I was after. Unfortunately after about 2 to 3 weeks of use, two things happened. Number one, I simply just didn’t feel the effects anymore. Number two, people around me that I saw on a daily basis, started to comment that my attitude had changed. I seemed more irritable, and almost like I had a shorter temper. I didn’t notice it, but multiple independent people did. I quit use and try again about six months later and had the same issue, it stopped working and people noticed a mood change.

Now I asked this question for a few reasons. First off, since this was technically a mixed formula, would a pure formula potentially yield different results? Has anyone else experienced something like this with magnesium, from what I have seen this is not at all a common side effect.

Finally, if I shouldn’t try magnesium, what can I add alongside what I am already taking to try to achieve that relaxed body feeling. I’m not needing to feel high, but just a little bit more relaxed as the single supplement I take now does help, but it’s not quite enough to put me to sleep. Thank you very much!