Hi Angelico and how exciting!! I had ELCS with dd3 6 months ago.
I didn't take arnica, considered it but read enough to convince me it doesn't really work.
Didn't have trapped wind pain but it is common apparently. The best advice I was given was to get up as soon as poss, taking care not to strain yourself and obviously not to go legging it around the ward! But just standing stretching legs arms gently all helps, lying scrunched up in bed does not help.
With regards to painkillers, definitely take what is offered as it is hard to get on top of the pain once you let it take over.You may only need something for a day or two or a week or two.I took mine (and i breastfed, still am ) for two weeks as as had a slight complication. They will give you a suppository straight after the op,you don't even realise its done. It wears off after a few hours. The spinal helps for a bit but mine wore off quickly for others it is longer. It helped me breastfeed actually having the painkillers as it is difficult to hold the baby when you are hurting. Wards do get busy but they seem to do the painkiller rounds regularly. If for any reason it is not enough get your dh or dp to insist on something different. There are different pain relief methods and each patient has different needs.
The constipation thing is not the same for everyone, I think just eating Lots of fruit, veg and drinking water is best. I had it worse with a natural birth, you can never tell! You can take peppermint capsules after the op and they also have medication for gas pains in the hospital. I didn't take anything but took in a little orange juice and fruit and had water but don't over do it eating bags and bags of grapes! Just resume healthy eating at home.
I had the spinal as I said, it was fine. I did have a complication and the anasthetic lasted the entire time they were sorting me out (uncommon thing so don't worry)
Last couple of things- the pain was not as bad as I imagined but I did keep on top of it. Painkillers do not affect your baby when bfing, and massage bio oil onto the scar twice daily from about 4-6 weeks or when scar has healed- it is getting rid of my scar nicely and prevents tightness, numbness and overhang and helps prevent hard scar tissue forming. I also took a sleep mask and earplug and big extra pillow in as ward is noisy. Good luck