I am a teenage male with ADHD. For about the past 2 weeks now, at night I have, for a very brief period, felt out of breath. I have found this usually happens when I am thinking to much while reading. Usually a sip of water stops the feeling, but it is still worrying. Also, when I feel like this, I seem to remember things I have never seen in my life. For instance: Last night, when It happened, A very distinct phrase appeared in my head, "Nostalgic Seize". I felt like it was something I had heard before, but after I drank some water, It just felt random and out of place. There are different words each night. Please, if you can, try to explain what is going on.