How to avoid fainting during lip filler injections?

The last (and first) time I got Juvederm Ultra I got very hot, dizzy, and almost fainted. Im assuming this was a vasovagal response to the injection itself, as I’m happy with the results and had no issues after the appointment. I was only able to get about 0.7ml of a 1ml syringe injected though due to almost passing out. The atmosphere is comfortable and I trust my provider, so I want to get another 1ml injected as it’s been about 3 months. What can I do to prevent myself from feeling like this?