I've had 3 big ankle surgeries and found the recovery hard - especially the first one which was much more serious than anticipated and left me non-weight-bearing for 6 weeks instead of the expected 2 weeks weight-bearing-as-tolerated. So I feel your pain!
Definitely hire a wheelchair. Use around house and DH can take you out at the weekend or when he's not at work. If only lower leg is in plaster a walker is good too - rest bad leg on knee on seat, easier than crutches.
Cinema is a good way to get out of the house - you can get a wheelchair space. We saw a lot of films during my recoveries!
Put your leg up as high as possible as much as possible. Lie sideways on the sofa and put it up on the back if you can. Will help with pain and swelling.
If just lower leg in plaster, an ice pack under knee can help. Or a really big one over the cast.
Ask to try different painkillers. I'm really woozy on codeine but fine on tramadol and oxycodone which are technically stronger, though it depends on dose. So people react differently to different drugs.
An office style chair on wheels is good for scooting round the kitchen if no space for wheelchair or until you get one,
Get DH to make a flask of tea/coffee in the morning and leave near where you sit.
A crossbody bag is good for carrying small stuff around.
Get a cast cover so you can have a proper shower. And a shower stool, and a second one to prop your leg on it room. I actually used a garden chair as we have a wet room.
Remember this is temporary!
Apologies for repetition of previous posts, I have read but have goldfish memory!