Siren is going to be okay!
Yes, she has tumors in her head, but the new doctor she went to has told her not to worry. He says all of her symptoms are from migrianes, and the old doctor blew everything out of proportion when the tumors were found. Apparently people can be born with tumors called Cavernomas and live with them for their whole lives without ever knowing they exist. The blood that was in her brain was old blood, so her tumors were bleeding at one point. She'll have to have an MRI every six months to monitor the tumors, but she isn't in any danger as of right now.
The new doctor also noticed that the old doctor botched the Spinal Tap she did, so she is on pain meds for that but should be feeling like her normal self within the week.
I am so relieved. Thanks so much for all your kind words of support!