I must be screwed in the head

There is no other explanation for it. I MUST be screwed in the head. I am totally focused on food and eating all the time. I'm trying sooooo hard to eat 1/2 cup at a time over 20 mins but I just find that the restriction is causing me to pick at food all the time. Most of the time I sit down and get through my half cup in 10 - 15 min but other times I just eat a little bit of whatever is handy - including chocolate. Today I ate a small tin of salmon and I must have eaten it too quickly because I felt a terrible intergestion pain then I bought a little bit of it back up. It wasn't a vomit so much as a regergitation. Now you would think that would have stopped me but Ohhh No.... I wne on to have some ice cream with my son and some peanut butter from the jar. I'm feeling terribly out of controle and hating myself.