I am going to state the obvious and say that it's rather dangerous to habitually overdose on NSAIDs and then take N-acetylcysteine to clean your liver. If I remember correctly, it's only good within 72 hours of overdose, but if you choose to detox your system, why take the NSAIDs in the first place? If you have severe pain, speak to your GP about referral to a pain clinic. As for the numbness, I agree with Revenged, go see a real doctor - a neurologist. Numbness can be cause by several factors, not all of which can be seen on routine blood or CT. other tests to consider are MRI and specific blood tests for various vitamins. I am not sure whether numbness is related to thyroid but you will feel a heck of a lot different before you start feeling numb, IF you had thryoid problems. But in all seriousness, stay away from chriropractors, like you said, you dont expect much from the guy if he is playing with an x-ray, so why would you trust his diagnosis?
good luck in your hunt for an answer.