I am so sorry to hear of your predicament and wish you God speed in recovery. How about finding a support group for people who share your condition? Maybe you can ask your Doctor if he/she knows someone that shares your condition whom you could look toward as a mentor. Your friends are frightened because they do not understand what you are going through. Please don't fault them, it's human nature to be scared and cautious of the unknown. Try seeking out people dealing with what you are and I'm sure you'll make many friends. I wish you wellness and serenity friend.

http://www.braintumor.org/patients-f.../find-support/
http://www.dailystrength.org/c/Brain.../support-group