when the parasites are being annoyed they can do all sorts of things, as you know probably too well from this happening before. it's very scarey...if it helps at all...I've had panic attacks like this due to parasite cleansing. out of this world panic attacks, sometimes accompanied by electrolyte imbalances and heart rhythm abnormalities. also very low blood pressure (at other times very high). I've been so weak I couldn't stand up. and breathless. you think you're dying, I can understand how you went to er.
to me, this sounds like parasite induced. I've had it from MANY different herbal preparations, it was not herb reaction in me, it was parasite reaction to the herb.
take care of yourself and make sure you feel an internal strength that you're able to withstand the level you're cleansing at. there was a time I pushed it when I was too weak, hoping once I just got past these symptoms I'd have killed them. for me, it made no difference in killing them. and it is possible to make things worse. if you're noticing benefit after panic attacks or adverse reaction, then it's okay, and as long as the adverse reaction isn't too severe or causing you any harm...if you're having virtually no good effects on your condition and these reactions are taking place, it's a sign to rest and rebuild.