I totally understand what you are going through. I have a two and a half year old son myself who will be 3 in August, and he does not hit nor is aggressive, but he has major behavior problems. He is defiant and destructive, like you, me and my husband have tried everything, he does not care about discepline or consequences, he loves to take everything appart to see how it works, and has turned our whole house upside down. you can read my own request that I wrote a couple of weeks ago if you want, it might help a little, it will be under the special needs catagory. Let me assure you, you are doing nothing wrong, some kids just have problems, and need outside help, other than mom & dad, has your pediutrician referred him to a pediatric neurologist? That is what I would recommend, because it doesn't sound like your pediutrician is taking you seriously, your son might have a medical condition that could be corrected with medication, but if you do not want to medicate, that is understandable, and there are other options. Is your son only like this when he is in daycare, or is it all the time? Does he get aggressive with adults or just other children? You can look into Help Me Grow, they are a free service from the government that provides programs for children birth to age 3, my son is currently seeing a behavior specialist and a speech therapist because he cannot talk, in addition to his behavior problems, they will probably assign your son a behavior specialist, the one that is seeing my son though, is not very assertive and I don't feel he is right for the job, but maybe you will get somebody different, it all depends, it's free, so it is worth a try, if you are interested, the phone # is ###-###-####. My son is currently on Ritalin, and it does help him, he is only on half the dose right now, we are waiting for the OK from his doctor before putting him on full dose, but I can see an improvement already, he is calmer and able to focus and actually sit still and watch TV for 20 minuts, which is a big deal for him, because normally, without meds, he is out of control, he is constantly running around all crazy and destroying anything he can get his hands on and cannot focus on any one thing for more than 30 seconds, the doctor can't give me a firm diagnosis just yet, but believes he may have ADHD, he is very intelligent, that is what gets him into so much trouble, child proof devices do not work for him, he can figure anything out and has excellent problem solving skills, when he wants to get to something, he will figure out a way to get to it, even if it is up in a high place, he is very resourceful in that way, he will use his toys for step stools, and can climb gates with no problem. But the medication is keeping him under better control now, thank God! I don't know if your son has any of thiese problems, or if it is just the hitting, but I hope my advice helps a little, please let me know if anything chainges and you can write me back if you have any other questions or just need vent, believe me I know your frustration, there is behavior that goes beyonde just terrible two's, and I hope you can get your pediutrician to understand that. All the best of luck to you, you are in my thaughts and prayers.