Did they give you any medications, that could cause it. I've never felt that way so it's hard for me to try and help you. I get rashes on my hands when I'm going through die off but never my whole body feeling like it's on fire. What's your diet look like?

Wormwood causes insomnia and nightmares. I've been using a little herbal concoction including it. I also have had terrible insomnia, I jerk awake at night, and even run out of bed thinking something is wrong. Wormwood can also cause dermatitis

Defined: Dermatitis (eczema) is inflammation of the upper layers of the skin, causing itching, blisters, redness, swelling, and often oozing, scabbing, and scaling. ...

http://www.merck.com/mmhe/sec18/ch203/ch203c.html
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Perhaps after the Wormwood works it's way out of your system, your skin will feel better. If you research Wormwood thoroughly, (try googling-wormwood central nervous system) you'll find that all of your symptoms are listed as side effects of wormwood, excepting the potassium deficiency. The die off from parasites makes it much much worse I'm sure. Hope you feel better soon!