I am really sorry that you are going through this! Krys gave you a lot of great advice! I don't know which hospital you are going to, but make sure it's a good hospital that has a brain tumor board and is ranked high on US News and World Report.
Also, temodar works much better if you have deletions. I have an oligo and don't have the deletions. I was diagnosed in 2008 and had a partial resection then and another partial in 2009. It had upgraded to a grade 3, so I had temodar/radiation and then 6 months of temodar. The tumor was stable until May 2011. The dr told me I would have to start another chemo if it was larger in Sept. I got all of these "signs" to go vegan and I cut out all animal products in early June. I had already cut out sugar/junk food and was eating lots of vegetables/fruits/whole grains/nuts but was still eating chicken (w/out hormones or antibiotics), eggs and milk. The MRI in Sept 2011 showed no growth and the tumor hasn't grown since! That is what worked for me. This whole foods, plant based diet is really hard, but I do my best!
Please don't worry about how long you have to live. I know it's hard not to. I remember waking up in the morning feeling great and then I remembered and got this horrible feeling of dread. I was ok the rest of the day, but that happened every morning. I prayed that it wouldn't happen anymore, and it never happened again. About a week after my first surgery, I was driving by a cemetary and saw a funeral taking place. I started thinking about my funeral and started crying. On the way home, I drove by again but looked across the street instead. There was a church with a sign out front that said "people who worry find death in a hurry". Crazy!! Since then, I try not to worry or think about the bad stuff. I don't think about it every day anymore. I am very lucky that I don't have any symptoms/side effects so I can live a normal life and don't have that to remind me.
I research brain cancer survivors online. That helps so much! It helps me stay positive and I just keep saying that God gave us a miracle and keep believing that I'm going to live a long time. I am married with 3 kids (9, 12, 14) so it will be hard to leave them and not see them grow up. Being faithful and positive helps a lot. Like Krys said, it is better to enjoy the rest of your life than to be depressed and upset the rest of your life. It is your choice to be happy and make the bad thoughts go away. But I know how hard it is. I still get stressed before I get an MRI.
Before i started radiation/chemo, I went on this board to see what it was like for others. Not a good idea because it scared me to death. I drove back and forth to radiation treatments (1 1/2 hour drive each way) and the only side effects I had from radiation was hair loss. So even if a lot of people had a bad experience, it doesn't mean you will too.
I don't know of any long term oligo survivors either, but there is a post on this board where a lot of people with oligos post. Look for a post about oligodendrogliomas with a lot of responses on it!
I have talked to a man in Texas who has a daughter who was cured of a brain cancer (I think it was medullablastoma). She had surgery, chemo and radiation. It didn't work and they told them to call hospice. Instead they called a naturopath in CA and did what he said (supplements, juicing vegetables, going vegan etc) and her tumor disappeared and she is fine now. His name is Ben and his daughter's name is Josie. He would be happy to talk to you and let you know what they did. His contact info is on the website below:
http://www.bennunez.com/healingjosie/Josie/Josie.html
There is an "incurables webisode" on Josie too. That link is:
http://www.veria.com/video/webisode-the-incurables-brain-can
I also know of a long term GBM survivor (9 years or more?) who is on this diet. His wife posts on this board sometimes. Her name is Lauren Smith. Her name on this board is lsmith. You can search user names and read her posts. She is one of my "signs"!
There are quite a few long term GBM survivors out there and that is a great thing!
I hope this helps. You can contact me if you have any questions or just need to talk. Praying for you!!! Take care.