OP, please ignore the heartless posters. Those who have been there and have a shred of empathy know what you are going through.
I had a 34 week baby in SCBU and your post has brought back all the feelings.
I had people tell me I'm lucky I get to have a full rest and have someone else care for my baby 
I felt guilt whenever I wasn't there, but I was in a great deal of pain and the chairs in there really didn't aid my recovery.
I ended up in tears to my midwife that I was worried I wasn't getting the a balance right. She was wonderful and reassured me. The SCBU staff are amazing people. I am forever in debt to them for the care they gave my baby. They are so focused on what they do, but they don't know your medical history or what you are going through. Maybe say to them that you are struggling with pain and do they have or are y allowed to bring in more visions, footrest etc to make you more comfortable?
Please be kind to yourself OP. You are going through a deeply traumatic time and it will take a while to recover, both physically and mentally.
Your baby is thriving as they are in the best place. Take the advice of the staff there, but tell them when you are struggling. They have seen it all before and may know what will help.
Soon you will get your baby home, to cuddle and care for away from feeling on show all the time, and it really is the best feeling.