Worried about my furbaby

This past Saturday my husband and I were relaxing  on our couch  with our cat Bella. She suddenly fell off my lap and started to go into a seizure  for 30 seconds paddling her little feet around. Being that my husband and I have no children but our two cats, I was horrified to watch this poor helpless cat. After the seizure she ran into her safe spot behind the toilet. We put her in the cat carry and brought her to the emergency vet. They ran bloodwork, neurological tests, and checked her out. They found a mass in the back of her throat. They said it is a possibility that it might be cancerous but given that she is only five its unlikely. They recommend we take her to our vet and have her biopsy it. Other then that  they couldn't come up with a cause for the seizure...so I'm worried about my cat... watching to see if she will have another seizure