Is it true that its always thoughts that creates emotions?

Firstly, this question is related to this stack because during the mindfulness meditation we are told to be aware of our passing thoughts and emotions. I was going through a video that said that 'thoughts create emotions' but I disagree to this, Many times I am engulfed by emotions first, like fear, anxiety, worry, and insecurity and I scan through my mind and I have not had any particular thought, the emotion is right there without any reason. Then I do some mindfulness meditation to deal with that pure emotion. So, am I right that there can be pure emotions to deal with in meditation without thoughts? Broadening the question I would really like to ask, what's the relation between thoughts and emotions? How, where, and when do they get related to each other and influence each other?