Omeprazole and ct scan

I have been taking Omeprazole since December 2007 now so 2 and a half months.

I had the dose increased to 40mg 3 weeks ago as 20mg wasn't curing the burning in my throat.

For a few weeks now i have had increasing vertigo/dizziness and palpitations. I only linked the 2 to the medication just yesterday, googled it just now and confirmed my suspicions to the Omeprazole.

Other feeling i have had since taking this medication...

Severe dizziness
vertigo
palpitations
headaches/migraines
weakness
fatigue
sweating
nausea
bloating
stomach cramps
visual problems
intolerance to bright lights
aching joints
chest pain

Now my question to myself is do i come off the tablets and endure the misery of my acid reflux? surely there must be something else we can take for our stomach problems that don't cause these awful side effects.
Anyone tried anything else that worked and didn't make them unwell?

I have been taking OMEprazole for approximately 2.5 months and recently I feel dizzy to the point I want to get a doctor appointment to have an MRI or CT scan on my head - my fear is that I have a brain tumor. I feel dizzy as if I am going to pass out, occassional sharp pains in my head and I feel sick to my stomach. I also feel extremely tired and recently like the left side of my body is weak.

I am going to stop taking Omeprazole today to see if this is the side effect of the medicine. Anyone have similar experiences. If so, how soon do they stop after you stop taking the medicine? I was concinced I had a brain tumor - not so sure now.

PS I am a very healthy 50 year old who is a marathon runner. Lately I have sucked on my runs due to exhaustion.