it could be from a mix of a couple things, how much are you taking at one time? sometimes edibles are very sugar-dense, similar to candy, so the taste isn’t as obvious. if you’ve got a sensitive stomach, that can upset it pretty easily. that’s also the case if you’re taking higher doses at one time
that might be your issue there, that is still a lot at one time and it may actually be causing your heart rate to increase very rapidly, which might be why you feel nauseous. try cutting it up a lil more and just taking a piece every 15 mins to just space it out and give your body time to adjust more gradually