I've been taking hydroxy B12 for 2 1/2 yrs and it has helped tremendously. I have lyme and cannot tolerate methyls. Hydroxy has worked great for fatigue and neuropathy. All of the sudden, when I take Hydroxy now, I get extremely sleepy and sedated. My head feels strange too. This is even with a low dose. I added a little Adeno B12 and the sleepiness wasn't quite as bad but still there. Does anyone know what could be happening? It's miserable.