Hi, did you find the B12 shot helped? I thought perhaps you may be B12 deficient as it can cause weight gain, difficulty losing weight and sweating from the head among a lot of other symptoms. Generally B12 won't have much effect unless you're defificient in it. Though one shot won't necessarily make you feel better if you are deficient. May be something worth getting checked for and may be worth keeping in mind that specialist doctors say that B12 should be at least 600 to start to feel well but the current diagnostic cut off is around 200 so most people are being told they're not deficient when they actually are. Hope this helps.
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