I am a relatively frequent poster but I am so ashamed of how I am feeling and struggling. I am hoping someone can help me work through this and give me some ideas on what I can do.

I have an almost two year old son and a preschool aged daughter. I am at the point where I really don't like my son that much . He is extremely difficult and he is not at all pleasant to be around. Any time he wants something he tantrums, I can't open the door fast enough to go out, diaper changes, meals, you name it. We have to leave for everything fifteen minutes early because it takes that long to get him wrestled into the car. I have bruises up and down my legs from his kicking.
My poor daughter constantly gets the short end of the stick, we were basically asked to leave the pool last week, we are constantly working around her brothers melt downs, we left target without her school supplies, he dumped her new paints etc.

I work part time and my parents watch the kids. They look just as burnt out as I am and they avoid leaving the house with him at all costs. I just don't know what to do. He talks very well, 3-4 word phrases. His sleep is great 11 hours a night and 3 hour naps. He eats well most of the time, he isn't picky and loves meal times.

The terrible part is that I have a masters in early childhood education and have worked with kids my whole adult life. I know how to deal with kids but these tantrums are not like any other I have dealt with. They are violent, huge, and come with crazy frequency. I am spent, I don't know what to do. I have zero compassion for him, he just makes me mad and sad. My pediatrician hadn't been any help aside from telling me he will grow out of it...