I would strongly suggest addressing pain first. Look into Neuromuscular Dentistry. Be evaluated for sleep disordered breathing and myofascial pain related to a TMD issue.Look into Self-Administered SPG Blocks for pain and anxiety.
Congratulations on starting your Invisalign journey! It is normal when starting a new tray for it not to fit perfectly down onto your teeth all of the way and have some space showing. This is the space your teeth will move into! However, if you feel that there is too much space, it is a...
In my opinion the distance that canine must be moved is probably better for conventional brackets and wires ( braces) - not invisalign. You should go for at least 2 consultations to see what they tell you.