Hi Patrykia,
I am so sorry you're feeling blue.
Okay....let me take a stab at this sorting out biz.
1) It's difficult to be in the Christmas spirit when you've just experienced major surgery.
Your leg was cut, then there was hammering, drilling, sawing.....therefore pain.
Pain is draining causing discomfort and fatigue. I don't think any of us feel in the "spirit" to do much of anything when feeling like that. You have an excuse and reason for not shopping and decorating. Major surgery...as well as and the prep and recovery that goes along with it. I'm not into social media Snap, Insta, FB. It's great for many, just not me. FB is full of people portraying "the perfect life, with the perfect marriage, with the perfect kids" etc. Very Often Dramatized!
You are safest in your home right now as people are out scurrying aimlessly in the malls and impatient on the roads in a last ditch effort to tie up shopping. You're taking care of yourself. If you normally like being alone, you're not liking it now because you're feeling trapped in your recovery. We are somewhat, only for a time, due to limitations. It will pass.
2) Please don't consider driving while on narcotics and before you are released to drive. Not being allowed to drive is most frustrating because it causes that trapped feeling. I was chomping at the bit to drive. Then when my OS told me I could.....I didn't drive for days! It was the "no driving allowed" that made me want to drive the most

I had my right hip replaced and was given permission at three weeks as I was off the drugs.
Consider finding someone to purchase the pies for you, or someone to bring them instead of you if that's a possibility. Who wouldn't understand given your condition.
I found applying make up and doing my hair actually made me feel better. It took me days to try it and it was a modified version, not what I jokingly refer to as "full drag".....but it boosted my mood. You may find putting on a nice outfit with hair and make up to be rather enjoyable. Try it!
3) How about a picnic at the beach, on stable ground? Your son, dil and grandkids love you, they'll understand. They just want to see and be with you!
Please don't feel like you're blowing things out of proportion, you're just struggling a bit emotionally, as so many of us have and it will pass. I realize this isn't your first replacement and I'll bet if you think back you experienced some blue moods then too.
Warm wishes for peace of mind and a relaxing day. Things may even look brighter by tomorrow.
Sending a hug and healing thoughts your way. Hope you feel better soon!