I'm one of those people that are very sensitive to pain so I'm right up front with anyone on my care team. I've had to speak to a pain psychologist about it and after a 10 minute chat all my care team know I'm legitimate with my needs. I'm four months out and still take an occasional Targin or Tramadol when I overdo things - and being pain sensitive, it's pretty easy to overdo things just in the course of normal physio.
1) Have the conversation BEFORE the surgery, be sure your concerns are not swept aside.
2) The squeaky wheel gets oiled. If you're in pain, tell them in no uncertain terms that you are, what your pain levels are and what the pain feels like (ache, burning, throbbing). Characterize it so you get the other person to understand and empathize.
3) Don't underestimate a big ice pack used often and for long periods.
4) If you're not getting adequate pain relief, complain and know how to complain. Know the chain of command you'll use (nurse, floor nurse, doctor/surgeon, personal GP). In Australia we have a physician assigned to us whilst in hospital - they take care of pre-op tests and any complications from surgery. He gave me his mobile number and I used it when I got moved to inpatient rehab and wasn't getting my meds prescribed correctly.
5) Be aware of the official complaints procedure and don't be afraid to use it. You are a paying customer for a service. If you're not getting what you paid for complain. You'd complain in a restaurant about a poorly cooked steak. You'd complain if they forgot to put the oil plug back in your car after an oil change. This is NO different.
I was in pain before the surgery and I'm in a different pain now, but I know THIS pain will eventually go away. If I didn't have the surgery, I'd still be in pain so I'm not 'throwing away' pain-free living. At least I'm investing this pain in getting better.
My understanding is about 1 in 5 people are particularly 'pain sensitive' so although we're a minority, we're still a sizeable chunk of the population. You need to stick up for your rights and be an active participant in your care and rehab.
Feel free to msg if you want to chat.