Sounds like you had a wonderful patient who was grateful for you doing your craft. Do a compliment sandwich, but don’t sincerely.

Complement Boundary Complement

“Oh my. I’m flattered. Thank you, but I’m not comfortable with that right now. You’ve been a wonderful patient and I enjoyed working with you too.”

This is just an example of the compliment sandwich structure and you should adjust the wording to serve you.

As for the phone number, just tell him that you were doing your job and seeing him better is all the reward you need. Again, adjust the wording for your truth.