I'm insecure on my intelligence and ability to form conversation?

I'm willing to bet it was mostly because of your dyslexia but I'm sure being tired didn't help very much. The less sleep you get the less efficiently your mind works. Just because you have dyslexia doesn't mean you aren't smart. My little sister had a mild version of it for a few years but we just worked with her on reading skills and that kinda thing and now shes almost completely over it. I'm sure your teacher doesn't think your "thick"... everybody has bad days. Just keep working at it and things will start to clear up. I hope this helped :)