I Smoked A Bowl Of Meth With My Boyfriend And

I smoked a bowl of meth with my boyfriend and I was fine, feeling good. A few hours later Started our second bowl and I felt as if I had heart burn, didn't think anything of it and continued to smoke. An hour or so later into our third bowl I started burping alot and felt as if I was going to vomit... What could this be? Did I inhale too deep and swallow all the toxin or could be on a account of an empty stomach?