Could i have a cancerous tumor i have bad migraines nausea poor balance pain tender to touch onu right side of head?

Not likely: Your symptoms are not guiding towards anything specific. Your age is not an age common for cancers, so I would look for alternative diagnosis like migraine or others. It is still prudent to see a neurologist to examine your nervous system. Good luck.

There are many: possibilities and what you think is far down on the list. It is essential that you see your doctor for a proper diagnosis and treatment. That's the way to ease your mind. Peace and good health.