Hey there! Let's see if i can help.
First off, any other medications taken with/while on Paxil?
Second, 120mgs!?!?! Paxil (Paroxetine Hydrocholride) has a MAXIMUM LEGAL DOSAGE of 20-60mg/daily (25-75 in controlled release form) I truly hope that was a typo. (My source for that information, is "The Pill Book" by Bantam Books, 14th edition)
Thirdly, such a huge dosage over four years may have given you something called "Serotonin Syndrome". This is usually associated with taking a new medication, or upping the dosage of one you already are taking. Serotonin Syndrome has proven to be a rather rare illness, but your case is most assuredly an atypical case.
Common symptoms of this syndrome are * Confusion
* Agitation or restlessness
* Dilated pupils
* Headache
* Changes in blood pressure and/or temperature
* Nausea and/or vomiting
* Diarrhea
* Rapid heart rate
* Loss of muscle coordination or twitching muscles
* Shivering and goose bumps
* Heavy sweating
for legal dosages exceeding no more than 50-60mg/dailyThose symptoms look familiar?

And these are the common symptoms, not the Severe Serotonin Syndrome symptoms.
What with 120mgs/daily, and the way you were taken off (Cold turkey is a terrible system for weening off an SSRI, possibly the worst aside from instantly starting an MAOI after you quit said SSRI), that can alter the odds of developing this syndrome quite significantly.
"I've read the side effects associated with Paxil, and I know I not only suffered with them while taking them and wile being taken off of them, but I'm still suffering through them, mainly the physical side-effects"This statement speaks volumes to me. Since the syndrome is most commonly developed after starting to take an SSRI, or after upping a dosage, that seems to fit what you said in your post. I'd bet money that your symptoms developed after your dosage was increased to a level your body couldn't tolerate. I'm a clinical psychology student in college, and i know better than to prescribe 120mgs/daily and to quit cold turkey. The combination of the two could easily trigger this syndrome.
Call your Doctor, and demand to know why you were prescribed 120mgs/daily when MAXIMUM is 75mgs/daily in controlled release pill form. Also, pick up a copy of "The Pill Book" by Bantam Books, 14th edition
I will check back early and often for your response, and truly hope i am wrong. Remember, this is not a diagnosis, just me doing detective work.
Take care, look forward to hearing from you,
~Robert
Edit: Spelling and Grammar checks
The mind makes a terrible master, but a powerful servant.