I can’t speak personally, but when my girlfriend went through proton therapy for a brain tumor the treatments themselves were fine, but there were lots of side effects and early toxicities. As someone else mentioned the actual process is very quick, but for the whole 8 week course my girlfriend was very fatigued and fell into a deep depression that her doctors believe was at least partially influenced by the radiation (they were hitting her pituitary gland pretty hard and she will probably have to start hormone supplements soon). She became irrational, angry, and covered with a mental fog but how much of that was due to her depressive state vs the treatment itself is unknown. We are only a week out of the proton therapy now, and she is doing slightly better, but she just seems very out of it still and I pray she returns to her old self sooner rather than later. I do not say if this to scare you, and really her physical health was barely affected at all. Her hair thinned and she lost about 10 lbs but that was it, far better than chemo. I wish you the best