I'm sorry to hear about all your trouble. Its hard to answer your questions with the limited information.
Couple of more questions.
1. putuitary tumor? what was the pathology that they found?
2. severe headaches? have had these prior to the surgery? do you have a history of headaches? what have you taken for the headaches? can you tell me more about this?
3. pain on the left side of my neck and I have to hold my arm down? - could you be a little more specific and tell us what happens?
4. what kind of imaging studies have they done? MRI
certainly, what about MRA and MRV.