I've learned that you cannot deal with the interaction of a charge with its own field in classical electromagnetism. It is said, that this is simply the case with classical theory, and you have to deal with it. But how can this be? If accelerating charge is giving energy to the field, then it should be losing energy itself, but how can it lose energy if it doesn't feel its own field? Is the energy really conserved in classical theory, when one attempts to explain the radiation? I have never seen an equation, that would tell strictly, what kind of acceleration a charge would suffer with a given rate of change of momentum. I mean, that at least the rate of change of the speed should be less than if particle had no charge. How much less, precisly?