((hugs bridgie)) Parenting can make us seem useless, or awful many times.. but we have to remember, we are our children's world.
If it helps you any, I didn't have the patience to teach my eldest 2 to read.. I think I was causing more harm than help, I left it to the school to fill in where I couldn't. I really just couldn't help them without getting frustrated.
If he's not interested, try finding something he is interested in.. try labelling things around the house, so he sees the words and can put it with the object (fridge, mirror, wall, etc)
Try not to be so hard on yourself.. you are doing the best you can, and the best you can, is all that matters
((((HUGE HUG))))
Sorry about your head.. I hope it feels better soon...