The symptoms for nicotine withdrawal and nicotine OD are very similar. Anxiety happens to be a symptom of both withdrawal and too much nic. My bet would be that you're not getting enough nicotine. Not only is the absorption way lower on
vaping, the method of action is entirely different and affects the brain with much less "satisfaction" than smoking did. When just quitting, your body is craving those big dopamine/serotonin dumps that you really don't quite get with vaping. And since smoking nicotine is one of the best anti-anxiety drugs on the planet, nicotine withdrawal actually enhances anxiety in a big way. There are many, many threads on this forum about the symptoms you are experiencing, and you should check those out. Best to you.
P.S. For those that think you can get way too much nicotine from vaping, there isn't a single case on record of anyone getting nicotine poisoning from vaping nicotine. For the same reasons (method of action), the patch isn't even considered addictive by science/medicine.