Unwell since root canal- Any link??

For six months now I have been unwell. What I am wondering is if my symptoms could be linked to my root canal I had done at the time.
My first symptom was after the root canal: my were stinging all the time, kind of like I never had much sleep. Started to feel kinda foggy so made an appiontment with an optician to get my eyes checked, which came back all clear. Then one day I was driving and got really lightheaded, like I was going to pass out! But I never. My heart started beating pretty fast, which I think was down to getting lightheaded and then panicing. So made appiontment with the doctor who took some blood test and did my blood pressure which was slightly high at 140/90 I think. they all came back clear. The lightheadedness started coming on more frequently, my eyes were feeling funny and slightly blurred, tired all the time and was getting back pain between my shoulder blades on and off, and feeling my heart beat like I had palpatation.
So far I have had numerous blood tests, ECG, EKG, X-rays, abdominal ultrasound (to check adrenal glands, kidneys, gallbladder etc..) a 24hour urine collection. All of which came back clear except blood pressure still up(only 27years old)
I have been back to the dentist to see what he thought and if he'd pull it. He said the tooth was prob. alright and would not pull it due to his ethics and he has refered me to a dental hospital to get further tests on it.
I am now getting frustrated because no-one seems to know what is wrong and can't now remember what its like to feel well and good. If any one has gone through something similar and had any advice I would be very grateful. Just don't know what to do !!!
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