Thank you everyone for the advice, here is an update for anyone interested in my situation...
I kept persisting throughout the week having a tiny bit every day trying to desensitise my body, my heart and blood pressure symptoms are still elevated upon smoking however they are no longer as bad anymore and of no concern to me whatsoever, but the effects on my gastrointestinal system is much worse...
Everytime I have a few tokes on my vaporizer my digestive system becomes overactive and stimulated, I start having stomach spasms, acid reflux and and pain, and soon after I start belching and bringing up mouthfulls of stomach acid and food, this lasts for several hours and even after the effects of the cannabis have worn off the nausea and the quizzy puky feeling remains with me for the rest of the day.
I have been taking anti-nausea medication which helps a little but the cannabis has really messed up my GI tract and changed my regularity. I have now taken 2 days off trying to let my intestinal disturbances settle down.
For those who suggested benzo's, I am also unable to take them due to adverse reactions, basically my Autonomic System is totally screwed up unlike anything you guys would have ever heard of, every class of drug produces its own unique individual adverse reaction with me.
I've been living with this bullshit for 10 years without being able to find a cure for it, but my Neurologist has finally been kind and willing enough to do some experiments and document my adverse reactions under supervision and agreed to to publish my freakish case in a medical journal.
If I can finally get some recognition it may spark an interest in the scientific community enough to work out the type of damage that resulted in this major chemical sensitivity and this pain in the ass of a condition Im stuck with. Also hopefully I will no longer have to bust my balls trying to convince people my reactions are not anxiety related. The advice given to me by you guys to stop all drugs is fair enough and probly the logical solution however things are a bit complicated in terms of finding an effective pain managment that my body can tolerate.