Thank you for your query.
I can understand your concerns regarding the headache. It would have been better had you shared the size of the tumour and the management being done for it.
When was the last MRI
done? What are the findings on retinoscopy?
In case the tumour is increasing in size you can experience the bizarre symptoms that you have described depending on the involvement of the surrounding tissues. It shall be better if you discuss the problem with your treating doctor who shall guide you accordingly.
I hope I have answered your query to your satisfaction.
Wishing you an early recovery.
Rajiv K Khandelwal