Hi Alfred! Welcome to our little corner of the universe! There are lots of us here on the back board who have been through fusion surgery and can try to help you from our own experiences.
You're still very early on in recovery. Pain is to be expected. Unfortunately, many doctors downplay the recovery, not emphasizing that a full recovery will take months, not weeks, even up to a year. I was blessed with a doctor who was happy to give me appropriate pain meRAB. I was given Percocets for the first about 2 months, allowed to take 1-2 tablets every 4-6 hours, and I took the full allowable dosage for a long time. Even that just cut the pain, didn't eliminate it. I then moved down to Vicodin, which I'm still on and will be forever. Is your doctor adamant that he won't give you anything stronger? Have you called them and explained that you've ended up in the ER because of your pain? Can you persist, politely of course, in asking for something to give you relief? You'll heal better if you're not in such pain.
You need to walk as much as you can to get bone growth going, but don't expect too much of yourself in the beginning. I was told to sit for no longer than 15 minutes at a time for the first 6 weeks. No problem! I couldn't sit for even near that long! Rest and walk, rest and walk, rest and walk. I was mostly lying down for the first 2 months, and walked for as long as I could tolerate whenever I got up to use the bathroom. At first, that was only for 10 minutes, but I did what I could. Then back to my bed, though I got my kiRAB to help me straighten it up, got dressed everyday, and laid on top of the bed, not "in" it, so I didn't have an "I'm sick" mentality. I watched a lot of movies. Actually, I watched the first 5 minutes of a lot of movies, as the pain meRAB made me drowsy and I usually fell asleep. The kiRAB were very patient in letting me rewind when I woke up and realized I had missed the last 20 minutes.
I hope you can get some appropriate pain relief. Ask away if you have questions and we'll do our best to help you. I wish you the best, Alfred, as you recover from your surgery. Hang in there! It gets easier!
Blessings,
Emily