Well, it just so happens that we had this EXACT scenario just last week.
My husband injured his back at work on a Monday. EXCRUCIATING pain. Off to the ER where they did basically nothing more than inject a pain killer that did not work and sent him home. My husband is a BIG, STRAPPING MAN who usually takes on the world and wins. He also has an extremely high pain tolerance and he was completely incapacitated by the spasms. He could not move. It took him over 30 minutes to crawl from the car to the house because he was that incapacitated. On Wednesday, he was walking from the bathroom to the chair in the living room, his back spasmed so severely, it completely incapacitated him once again and he ended up sprawled halfway on the floor with his face planted into the chair. This time, it took an ambulance to return him to the ER.
So, now you know how severe spasms can be, let me continue by telling you that we were scheduled to leave on a vacation on Saturday. Two children....ages 8 and 10, with the 10 year old being special needs. We told them we would not be able to go on vacation and they were sad, but you know what? They wanted to spend the time with Daddy and take care of him instead. The topper to this story is that we were to travel with Grandma and Grandpa, too, and they too, were perfectly ok with cancelling the trip.
My children have spent their spring break this week getting up at 5:30am and driving Daddy into work (he's on very light duty) in their pj's and bathrobes. They don't usually ride in the car in their pj's, so they think this is new and cool! They've spent their afternoons driving Daddy to physical therapy and then sitting there for 45 minutes reading until he's done. And they are perfectly ok with it because they love their Daddy!
Today I declared Princess Day and my daughter is dressed to the nine's in her fanciest dress, complete with tiara and makeup and chocolate covered strawberries. I let my son pick a day and watch movie after movie after movie (which is his favorite thing to do EVER!).
Children will reflect the attitude of the parent and children will adapt to the situation presented to them, based upon the attitudes of the parent. My children aren't having the spring break they wanted or expected, but they are having fun doing different things because as their parents, we are MAKING it fun for them.
To the OP, I truly do understand both your side and your husband's, but if it were me, I would stay with my husband and be a family at home until he can heal properly.