Why Is My Left Side Becoming Weak Even After Taking Nortriptyline For Permanent Nerve Damage And Tramadol ?

Hello, my name is Valerie. I have been on Nortriptyline 10mg cap #60 for 17 days,(three a day) I was perscripe this medicine for pain, (I was told that I have Permanent Nerve damage in my left knee). I had fluid drawn off my left knee on Feb. 5th. three weeks prior to this I had fluid taken off my right knee, but later found out that I should have waited at least 3 months before fluids should have been taken off of my other knee. I have been having chronic pain every since Feb. 5th this year. I gone to see several different specialist to try and figure out what is going on. The pain started in my left knee and moved downwards, my left foot is numb only under the bottom, I was told by a neurogist and was told by this dr. that he could not do anything for me, so now I am been sent to a surgeon to see if that can figure out what is going on. I know I drifted off of my question, but I have gained about 30 pounds since this incident on Feb 5th. I believe that the medicines that I been taking has a lot to do with this. I still have serve pain under my left foot all day long, I also have serve swelling of the left leg from the knee down. I am also taking Tramadol 50mg tablets (two at bed time) and Ibuprofen 800mg Tablets ( three or four a day). I have been walking with crutches since Feb. 5th. Ihave no useage of my left ankle and left side is getting weaker.