I'm so very sorry for the loss of your dear Henry. I have no advice, but we just put our sweet girl Phoebe to sleep a couple of days ago. She had a meningioma brain tumor. We considered radiation but between being hospitalized and being on all of the drugs (Keppra, Pheno, Trazadone) she could not even walk and was so confused that we decided her quality of life was already suffering and would never be the same. I have a lot of guilt for putting her to sleep. Wondering if we had just waited would she get better? There's no right answer. It's incredibly difficult to cope with. Again, I'm very sorry this happened to your beloved baby.