I there. Amitriptyline is basically an anti depressant, also used for pain modification e.g. in migraine. So it might mask the sensory input (or output) from the brain but if you have true nerve root pressure it will not mask/fix the dampened efferent response to the muscle. Paresthesia (pins and needles) in itself is not diagnostic of true nerve root involvement hower that with associated muscle weakness is more likely to be true.
Basically you need to get back to the Dr if you have true weakness. And if you're in Canada you should have access to great, free, public health physio. We cannot guide you for exercise of the neck in theis forum with such symptoms. You need to spring for at least one initial assessment and a home exercise treatment plan.
As for the lower limb symptoms, they could be from many issues, even side effect of the meds you are on. Best go back to the GP and see what more can be offered on their expense account
