This is Ellie Farnfield, a 27-year-old acupuncture student.
She was travelling on a train from Redhill to Surrey on Wednesday evening when she suddenly blacked out.
When she woke up, she found this note, which she subsequently shared on Facebook.
I hope by the time you read this you are feeling better. You had a seizure on the train and I took you off. You didn't hit your head but I may have hurt your leg as I walked on it before realising you were on the floor having a fit! sorry!
I'm also sorry I can't stay with you now but here is a coffee to perk you up later and £10 to make sure you get a taxi home.
Sorry I don't have anymore money so I hope you don't live far away. I've contacted people from your phone and medical help is on its way and you're with train staff.
Wishing you all the best and a quick recovery. Love Tom
Farnfield told the Evening Standard: "I have no idea who this man was or if he was sitting next to me but I wanted to show how grateful I am to him."
"If Tom does come forward, first of all I would like to give him back his money and then thank him for what he did. He deserves a lot of praise.
"It was so nice of him, it's one thing helping people but doing additional things like what Tom did is something else."
BuzzFeed has contacted Farnfield for further comment.