Talk to Internal Medicine on Numbness In Arms And Feet

When I sit for a long time, or stay in the same position while sitting or sleeping, I get numbness in my feet and sometimes my arms. I get numb much faster than other people who are in the same position. I had my vitamin B-12 levels checked, and they were low. I took supplements like Osnate D, Indrop D injections, and Mecobal. After a month, my B-12 was back to normal, but I still have the same numbness. What could be causing this, and what can I do to fix it?"