I found benzo's didn't worked very well on mxe, bringing lingering nausea, light-headedness & general discomfort. But plenty of people do not suffer any effects from the combo. I found this pretty irritating, because the lingering stimulation from mxe often kept me awake. I hate to say it, but I found alcohol (which I no longer drink) worked quite well calming the post-effects stimulation. I am not recomending you drink to calm the effects of mxe but a shot of something nice might calm the nerves if these effects are still bothering you. As Sammy said though, auditory shit is pretty common on mxe.
Smoking herb exacerbates the effects of mxe, but if you're at the tail end of the trip, a little weed might ease your tension but it's also possible it'll bring an increase in the effects that you're labouring with.
Best thing is to ride it out. It'll ease off soon enough. Good luck!