Caffeine can make people jittery and cause fast and sometimes anbormal heart rhythms. It sounds like you should stay away from caffeine. Reasons to seek a doctor would be if you are having passing out or near passing out episodes, palpitations, or if there's a history of young people dying suddenly in your family.
The total duration of treatment depends on the complexity of the treatment and is generally comparable to that of traditional braces. Typically treatment can last between 9 and 18 months. During your consultation, your Invisalign Provider can provide you with more detailed information.
She told me that Invisalign will be a shorter treatment time (12 to 18 months as opposed to about 2 years with braces). However the 1st orthodontist said that the treatment time is the same between metal and Invisalign (18 to 20 months). Although I love the idea of Invisalign my fear is that the results will not be as close to perfect as may be achieved with the braces.