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.
6-8 weeks after your records have been submitted to the Invisalign headquarters in the United States, your custom-made Invisalign aligners will be ready and issued to you. Aligners have to be changed every approximately 2 weeks and you are expected to wear them for at least 20-22 hours every day.