Is it possible to have surgery for my pituitary cancer?

Yes. Pituitary growths are not cancerous. They are benign. The treatment for large growths or growths that produce excess hormones except for prolactin is surgery. The treatment for growths that produce prolactin is a pill, surgery is needed only if the pill doesn't shrink the tumor. Small non-functioning tumor < 1cm usually does not need treatment or surgery.
Yes. Need to see a neurosurgeon to see if a candidate.
Pituitary tumors. Most pituitary tumors are benign, and hence not really "cancer" but because they occur in a deep, critical location, they can cause problems with other structures. Conventional surgical approaches are the trans-sphenoidal (nasal) approach, but larger tumors may not be able to be treated this way. Other treatments using radiation therapy (e.g. gamma knife, or proton beam) have also shown promise.