Star - I understand your hesitation about continuing to take Panadol after 3 weeks - but do keep taking it as long as you need it. As you can see from all the posts, each persons pain threshold is different and it can vary from one birth experience to another for the same person as well.
You will be feeling things more because you laboured for so long prior to the c-section. You're also caring for an absolutely gorgeous little baby which will have you getting up and down a lot - which uses your abdominal muscles.
I think you're doing really well to be on just 4 panadol a day. I was having tramadol and digesic for about a week and a half after I got home and was on periodic panadol for quiet a while as well. And I had only laboured for about 8 hours before my section!

Have you tried some alternate pain relief options? Heat packs, guided imagery etc. Maybe try and explain (again) to your midwife that you are reluctant to take medication for so long and is there anything they can suggest.

I hope you're pain subsides soon. Keep up the good work.

MG