I had similar experiences. I'd go back to school and people would question why I was gone, or they would think that I just didn't want to go to school, or I was lazy and didn't want to come. Since my concussion, if other students got hit in the head they would ask me whom I went to see or if I had any advice on how to get better or what they should do or whether the school was helpful.
I've had both sides of it. Students made comments about my not coming to school, and then when I came back they'd say, “Oh, you're still here” or that I was magically better after a while. Then I've had the other side, where it's like, “I just got hit in the head. I know you've been there. Can you help me get through it?” I've had both sides of the spectrum.