Weird problems when smoking BTH

Hey guys i figured this is the place to figure out this weird problem im having with dope. So i have been smoking BTH for about a year now and the last month or so i have been getting really lightheaded and dizzy when smoking. Even if i take 3 hits and hold them in only for a short amount of time i will get very lightheaded. Last night i smoked maybe 4 hits and went and sat down and like 5 minutes later i got so light headed that i felt like i was gonna fall out of my chair. Almost like i was in place but the world around me was moving fast. I'm not sure if they is anxiety related because i do have a serious anxiety problem..

Has anyone experienced this? any thoughts would help cause i am pretty fucking scared about this. Maybe its a cut in the dope? the stuff around here is pretty stepped on with sugar and other random ass shit. I am a cig smoker also if that matters.. Anyways thanks guys i love this community! safe nods..