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.
Q: How long do you have to wear Invisalign? A: That depend on the severity of your case. You are given plastic trays to fit over your teeth that have slight adjustments in them. They are changed every two weeks. I had 16 sets of tray plus I had 3 sets of refinements. My total treatment time was about 10 months.