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. there is a communication probelm. A lump in elbow creasem even if it is atumor, pressing on the blood vessel cannot cause an headache. And moreover how come the doctor diagnosed the lump as tumor with investigations? Its seems ridiculous. You should certainly seek help from some other doctor. Most probably the lump could be a lipoma
which you need not bother about. But still get a second opinion
Either the hospital doctor did not know what he was talking or else
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.