Had FUE hair treatment when can I start drinking fizzy drinks, alcohol, and coffee?

Specially first 10 days we suggest not to use cigarettes. There is no any obstacles to drink coffee or gassy drinks or to eat nuts

All of the things you listed are safe to consume immediately after your surgery, except for alcohol. For that, I would suggest waiting at least a week, preferably two, before drinking moderately. You should always ask your doctor if you have questions or concerns about post-op care.