I have plenty of thoughts! First, it's not the nerves healing. You said it yourself "I can feel every cut of the scalpel". That's it, you see - it's the incision deep inside that's hurting. And why is it hurting? Because you're not taking sufficient pain meds. To start with, amitriptyline is not a pain killer, it merely calms down the nerves and changes the way pain signals are interpreted by the brain. Taking only 2 paracetamol at night and an 'odd couple' during the day is totally inadequate.
Don't you have any prescription pain meds like codeine or Tramadol? You should be taking them - as prescribed - for another 2-3 weeks at least. Or, you could take 2 paracetamol 4 times a day, last one just before bed with a codeine and amitriptyline at night. Also take your meds on a regular schedule which means one dose is due during the night. Set your alarm if you have to but take them at regular 6hrly intervals.
Are you doing any exercises?