Hi,I am 77years old, male 5 c6 145 pounds. I have dvt and have been taking warfarin for a number of years. Chronic lower back pain. Recently experiencing tingling throughout my left leg when I lie down. I swim two or three times/week and bicycle regularly during winter (Las Vegas) but lately only the swimming. I spend quite a bit of time sitting, tv, reading etc. Recently had normal one-year blood workup with no negative reports. Any ideas????