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.
At least 36 weeks: Usually invisalign trays are exchanged every two weeks. If the teeth do not move properly or if the trays need to be refined, the time you have to wear the trays will increase. Your provider should give you a good idea of how long you must wear the trays to achieve the desired correction.