Quick question, i work in a pub and sometimes its really busy so i have a can of red bull or a coffee, always have done, lately if i have a can or a coffee a while after i feel odd.. Lightheaded legs feel weak its horrible! Would this be a sudden intolerence to caffeine? If so i will stop altogether!!
If your symptoms occur repeated with the consumption of caffeine, it could be intolerance. Maintain a food diary and note down and monitor your symptoms. This may help to narrow down the search.