Been taking nsaid (tylenol/aspirin) for over 10 years often every day . i want to stop. how likely do i have liver and kidney damage?

Depends....: Duration of use is important, but you haven't told us the frequency (once a week, once a day) or dose (1 pill a week, 20 a day?), nor have you shared your co-morbidities (particularly underlying liver or kidney diseases) or predisposing factors (alcohol intake, etc.). Testing is easy to allay your concern--please pursue same through your local doctor.

See your doctor: and discuss exactly how much of each med you took and how often. And have blood work to check kidney and liver function.