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.
If that is the case, we take a new set of impressions and I have Invisalign make us some more trays to detail things. The process for this is identical to what I described earlier. The new trays will come back in 3-4 weeks and we will continue with straightening your teeth. Invisalign refers to these as refinement trays.