Hmm this doesn’t sound ideal for a long haul flight but are you able to offer a little more clarity about what actually happened?

You mention snack wrappings as an issue and then no further mention. A wrapper is pretty easy to deal with, were there multiple? I’m a bit lost on this.

You then mention returning to your original faulty seat after a few hours of lie-flat sleeping. However you don’t mention two things A) the exact hours at each seat, it could be 6 hours on a lie flat and then 3 hours at the original or some other fraction between the 2? I can’t remember the routing as I type this.

You also fail to mention what happened to or how did that person react to you moving back?

The mention of slip discs in your back is probably pivotal in all of this. Its only come to light on here later in your post. Maybe you should have mentioned it earlier on in your flight and your original post.

This may help others give you a more suitable or accurate suggestion as to where to go next or what to do or what answers you might get.

Thanks.