Thiamine dosage for general eating

[Lamarck]

I heard Georgi say on a few podcast appearances that thiamine is really the only supplement he takes because a diet high in carbs/ sugar depletes it and taking it lets you eat a few hundred more calories for the energy.

I wonder if vitamin B1 thiamine is unsaturated like vitamin A, because I became cold after trying a normal dose of it (100 mg-200mg) last week. I've been hypothyroid my whole life but i take levothyroxine 100mcg every day. Then again, perhaps it just lowered all my other B vitamins.
I developed a fever with chills after adding magnesium glycinate thinking it depleted magnesium. Maybe it had the opposite effect and sped up my metabolism too much? I got weakness of the muscles and crazy soreness in my shoulders and neck from sleeping on them like it was an overdose of magnesium. It only got better once I took 300 mgs aspirin for the pain and the next day the weakness and soreness was gone.
I feel much better now and my digestion has been weirdly good ever since, but I'm hesitant to supplement B1 for energy maxxing again anytime soon. I may already have good levels of it despite all the extra sugars/ carbs in my diet.
If anyone has experience or advice to share regarding thiamine supplementation in general when it comes to getting extra carbs it would be more than welcome. I may have just had a reaction to the specific source being the potent powdered version from lifegivingstore, so share sources down below as well.

[Ecstatic_Hamster]

I find lately that I feel much better without taking any vitamins other than K2 MK4 and D3.

Thiamine makes me feel worse.

[Lamarck]

@Ecstatic_Hamster Glad to hear I'm not the only one

[Ecstatic_Hamster]

@Lamarck even magnesium causes me to feel worse.