The symptoms look to be related to your anxiety and feeling scared may be a phobia of something.
The anxiety starts and leads to a vicious cycle of head going numbness,hands ad feet getting cold and sweaty- leads further to vomiting
This increases the acidity tremendously, so vomiting relieves some of the symptoms , but the cycle repeats.
You should visit the Psychologist
or a psychiatrist
and also to get a symptomatic treatment for the acidity like PPI and antacid gel and domperidone