I'm sorry you both have to go through this. I suggest you call the hospital and explain your situation, hopefully, you'll get someone interested in helping. There was a comfortable recliner in the room during my last procedure, another time, my husband was offered a metal folding chair.
Personally, I think you should take your daughter's offer to help and don't worry so much if she really wants to. If her "help" will make life easier for you and your husband - take advantage of it. I'm sure you would help your daughter if the situation were reversed.
Ask your husband for an honest answer about what he wants/needs from you. Sometimes, I'm more comfortable when my husband is not there. Your husband may actually be relieved to not have to worry about how you are handling being there for him. If being there all night will cause a nasty flareup of your pain, come to a compromise.
Everyone thinks that helping someone is a gift. Well, we can't all be givers all of the time. Sometimes, we need to be receivers, otherwise, how would all these givers get to give. You may need to give your daughter (and others) the gift of being allowed to help you. I wish I could say htis better right now but I'm finally starting to get sleepy.