The reaction against baking soda is like this in the first days of treatment. But then with a bit of patience your skin will regenerate and grow healthy without the damn yeasts under it.
Is the price we have to pay when starting the treatment.
Don't forget to wash your scalp because in your hair and in your bed there are full colonies of malassezia globosa and other bad yeasts.
Probably you used too much in the starting point try to decrease the amount of sodium bicarbonate.