DMT trips commonly have an electrical feeling for me, and I don't mean this in a negative way. Our brains are bioelectric machines...drugs like LSD have been shown to alter the bioelectric rhtyms of the brain and I have no doubt that DMT does to.
My last smoked DMT trip was my one and only full breakthrough experience...it was I think the most incredible and yet terrifying experience of my life. I was in a calm state before hand and I did ten minutes of mindfulness breathing meditation before taking the plunge. But oh I got the terrors alright, I got them bad...
I've had this feeling twice profoundly with DMT, the latter experience the strongest though. I don't think this was anxiety I took with me into the trip. I appreciate the importance of set and setting, but in certain respects I think the power of DMT overrules these aspects to a certain degree. "There is nothing to fear but fear itself"...sometimes I think DMT is capable of pressing our fear/terror button in a biochemical fashion. When you ingest DMT, your brain releases several different powerful hormones, including growth hormone, beta-endorphin, prolactin, adrenaline and cortisol. I imagine that levels of these hormones rise with ingested dosages of DMT. But I think the combination of cortisol, your stress hormone, with that shot of adrenaline, may trigger some ancient and primal brain circuits...which gives you the 'fear'. Also when I experience this, there often isn't anything in the trip as such that is causing this feeling, but I'm feeling it anyway, profoundly...I think it is the more primitive parts of our monkey brains screaming at our higher brain functions and overwhelming them temporarily. Maybe. Perhaps also the fear is an essential, inseperable component of some of these experiences.