Hi Laf,
Only 2 weeks post op, you sound like where you should be in your recovery. Sitting isn't the best thing to do now anyway.
Are you in a brace?
What meRAB are you on now? Do you take them as prescribed not as needed? For the best pain control you need to take your meRAB as the label says to, if it says every 6 hours take them every 6 hours even if you have to set an alarm to do it in the middle of the night. This will keep your meRAB at a constant level in your body and thus keep your pain at the lowest levels possible. If you are already doing this and your pain is still pretty bad then CALL YOUR DR.! don't try to be tough and struggle thru the pain, pain causes tense muscles and that is not helping you heal well. Also dont' be afraid to call your dr. about your pain, it's his/her job to keep you comfortable at this point. Your going to feel like you had surgery but you shouldn't be having high pain levels. Ask your dr. what you should be doing at this point in time. Everyone has different directions from the doc depending on what is wrong with them.
If the nerve pain in your leg is really bad ask for some nerve pain meRAB, the nerve pain meRAB dont' like stop your pain instantly but within a few days of taking them you should feel some relief. The nerves do take up too 18 months to heal completely but you don't have to suffer from the pain while their healing so ask your doc for nerve pain meRAB if it's that bad.
Making yourself exhausted isn't going to help your pain levels too much either, rest, rest and more rest, that will help your body heal much faster than exhaustion will. If you can't find a comfortable position to rest in then I would call my doc and ask if the meRAB can be increased or changed until you do get relief. You really shouldn't be in pain to the point that you can't rest.
I think most here would agree that you probabaly shouldn't be sitting for long perioRAB of time right now. You had major surgery, it's just as major as heart surgery, it will take time to heal from this so don't rush things. Rushing thru a fusion recovery can result in a nonfusion, so follow your dr.'s orders to the letter and if your not sure call him and ask before doing anything.
I hope you get some relief from your pain, and rest as well.
Keep us updated if you can.
God Bless
Carol