Have a pituitary tumor. I refused a synacthen test because I had my brain anurysim coiled 3 months ago. I read this injection can cause veins to burst.

Brain. If you were coiled three months ago it is unlikely that this test would cause a rupture, probably best to speak to the interventional doctor and get an opinion.
See neurosurgeon. Aneurysm is an artery, check with your aneurysm doctor.
Medicine NeverSimple. Avoid decisions driven by fear: common but paralyzes & greatly degrades your quality & length of life. Study: http://en.Wikipedia.Org/wiki/acth_stimulation_test http://emedicine.Medscape.Com/article/116467-overview http://emedicine.Medscape.Com/article/116467-workup, etc. Your primary medical decision maker is always you. Rec: work at getting much better at the task & seek excellent assistance.