Yes, of course. His pain and state of mind are well written. I hope. The other option is that Jim's writing is a mess.
Harry is a mess.
Jim told us that he wasn't planning on 12M in his original plans, but has come to realize that he needs to write the process of Grieving Harry, Stressed-to-mental-unwellness Harry, PTSD Harry. As Mira says, that's what we're reading... that's (very much, for very many who go through it)
exactly what it's like.
I think Jim wasn't exactly clear how Harry sees things, how he acts, on the far side of that process.
Jim needed to write Harry's experience, to find out about Harry for the rest of the series.