I've been on coumadin for 30+ years & have never had any side affects, thank goodness! And, for 25 years, coumadin & Lanoxin were the only 2 medications I took so I would have noticed it. I'd have a harder time noticing side affects now, since I take 16 meds daily.
I echo what Marsha advised.....when in doubt, see your doctor. Good luck!