i am currently on warfarin for a svt, which i am told is common with vericose veins, i have been on it for almost 3 weeks and i am starting to encounter many of its side effects, lower back pain that is constant, stomach cramping , body aches, tightness of chest and numbness in my left hand as well as hair thinning. So far they have me on 5mg a day and 1 to 2 times a week 7.5. Should i be worried about any of these symptoms anjd take them as a warning sign/