For the last 2 years iv had extremely bad dizziness.iv had every test you can think off,MRI,ECG,EEG,Adrenal test,blood tests,ENT tests yet they all come back normal.I have quite bad anxiety and depression and i drink quite alot of caffeine.i could easyly drink a 2.5 litre of coke a day.iv had trouble sleeping for quite some time,i wake up at say 12-1 and within 30 mins i feel really weak,dizzy and tired yet i could of slept for 10 hours.before all this dizziness started i used to stay up all night on the pc drinking coke and smoking basicly.could this be some sort of problem with caffeine and if so what should i do?i had 2 (small)bottles of coke and a can in 1 day,the next a (small)bottle early in the morning and the next day i felt so ill i had to go back to sleep after waking up at like 1 in the afternoon.is this caffeine?could the caffeine be making me have bad anxiety symptoms? thank you very much in advance