i have been experiencing numbness in both of my legs on a regular basis when sitting for approximately 10 minutes or longer in the same position, i have had 3 major spine surgeries, so i have just assumed that this is a result of the sugeries. it is very painful when i do stand and i have to stand still and wait a couple minutes in order to walk. any thoughts? i am 5 7 and my weight is 127, so i do not have a weight issue, however i do have thyroid disease hypothyroidism and i take synthroid .05mg per day also have several thyroid goiters?? i have sleep apnea as well, so i do not take any narcotics for my spine.