Thanks for choosing health care magic for posting your query.
I have gone through your question in detail and I can understand what you are going through.
The knot may not be related to your vomiting
or headache. However it needs proper physical examination to confirm what it is. Further you have stated that when ever you do something different from normal you have this vomiting and headache but have not stated the exact acts. It could be a positional vertigo
Hope I am able to answer your concerns.
If you have any further query, I would be glad to help you.
In future if you wish to contact me directly, you can use the below mentioned link:
Wish you good health,
Dr. Srikanth Reddy M.D.