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A pituitary tumor that is symptomatic with headache and seizure activity should NOT be treated with pain medication. You need treatment to shrink the tumor, for example with Parlodel or consideration of surgery. You should seek emergency care by going to an emergency room I have no idea what you mean by seeing a Neuron possible you mean a neurologist.
No they do not shrink it with radiation. As I mentioned above, medication like Parlodel can be used or surgery as a cure. The tremors are seizure related activity most likely due to the tumor. They are not a symptom that should be treated but due to the tumor you have, which needs treatment.