Weird shit happening(brownies)

So this new batch of butter that I picked up from the club is grade "aa" quality, 35$ for a qp of it where other butters are 40$ for a whole pound. At first I was sketchy about it.. thinking i got ripped off badly, but I gave it a chance. The first time I tried it was on ONE piece of toast, using less butter than one normally uses to butter toast, a moderate amount. The effect was desirable to me, eyes feel like their on warmers, head stone, almost like my head was solid and my body was floating, this lasted for about two hours before I went to sleep, nothing big just a pleasant stone I thought. When I woke up the next morning I didnt feel anything at all, an hour rolls around and I start coming up at a very fast rate, almost like smoking. My feet go numb and so do my hands, my body is going crazy and my heart feels like its about to beat outa my skin. Another hour passes and the feeling diminishes slightly, one more hour passes and I start coming up again, but differently, more of a mindfuck indica stone, where i couldnt concentrate and I felt like I was going to pass out from being too stoned in class, I could barely hang on to concsiousness for the whole hour. I came down feeling very sick and smoked when I got home, went to sleep and the next morning I came up a little bit in the morning and felt a light, slightly pleasant stone for around 4 hours. I'm not freaked out or anything about it, ive been on brownies in tight situations before but I don't understand why my friends who are affected by everything the same as I am can feel the things for about 3 good hours and come down immediately? I am a bit fat, would this contribute to it?