I would see a chiropractor. Numbness can definitely be caused by pinched nerves, and, since nothing else is helping, this could very well be the case with you. A few good treatments, and you may be as good as new.
I'm sorry I should give a little more info....
I felt my disk slip and went immediately to the ER. They told me I had sciatica and gave me 2 injections and a valium and sent me on my way. I immediately became numb from my right calf down. The next day I went back to the ER because the numbness just didn't seem right to me. They sent me right back home. Day 2 I went to my doctor whom told me that there wasnt much he could do since my insurance had just expired (wow). Day 3 I went back to the ER, this time a different hospital, they sent me home again this time with a different prescription. By day 4 I was determined to find out what was going on with this numbness so I went back to the ER demanding answers. This time they ordered a MRI, once the doc read the results he told me I cauda equina syndrome and was going in for emergency surgery right away. I asked about the numbness and he told me once the surgery was complete that it'll be all gone. Wrong! I woke up still numb. He said give it time. Now here I am a week post-op stressed about this numbness. I know it's only been a week and I should give myself time to heal but this feeling of not knowing if feeling in my leg is ever going to return is nerve wrecking. I'm only 23. I've been reading other people stories trying to figure out does the numbness ever go away. Some stories give me hope others have me balling in tears. I don't know what else to do. I'm beyond miserable. I just want my old life back.
Where is the numbness? Was it caused by an accident? Numbness should be better a day or so after surgery. Contact your doctor if you are still experiencing it.