Rebecca,
Your child is still very young, but when I read your note, it made me remember when my very young child acted the same way. I took her to doctors and gurus and specialists and they were all impressed with her "spunk" as she had had open heart surgery when she was 14 months. One actually said "BRAVO FOR HER"......I was like.....OH MY GOSH! Well, it was very difficult and finally she was diagnosed with ADHD. I saw it when she was very young, but it wasn't until she was 5 that the so called specialists.....(you know, the ones that read all the BOOKS about this, but dont' live it) finally diagnosed her. It's a tremendous thing to deal with - the disruption, the disrespect and at such a young age. I guess my advise to you at this point, is, when he acts up, pick him up and say "mama loves you so much" and give him a kiss. When he starts school, if he truly is ADHD, it will emerge and you'll have allies then to get treatment or support. Sometimes it's not us as parents, or our styles, rather, it's something biological. Quite honestly, don't feel bad about giving your child a tap on the rear occasionally. My philosophy has always been......One is for them and more than that is for you. An ADHD child does not respond to spanks at all...in that case it's useless. They need love, structure, and consistency. My daughter used to laugh and laugh and laugh when I put her in time out. I started an earn/lose program with her........you do something good, you earn a dime. You do something bad you lose 2 dimes. At the end of the week you can go shopping......that helped some. I let her get what she liked, even if it was candy lol. Good luck!