Hi, I'm the exact same position as you. I was diagnosed with an Arachnoid Cyst two years ago. Mine is 40X30 mm in size.I also have some Colloid cysts. I've had to give up work also as I feel so ill. The headaches are unbearable and I suffer from intermittent facial paralysis. My health is terrible at the moment and I seem to be getting worse. I'm in the UK and they don't tend to operate on these unless they get really big. Mine is stable apparently. If you can have this operated on then do it! I would give anything to have mine removed.