Dee,
I was the same way - exploding on everyone, so over the top reactions!!! I scared myself. I saw my Dr and she put me on prozac. prozac is the number one medication for women of a certain age with anger issues. Along with therapy, prozac has been proven to help 'temper' our varying mood swings and unusual reactions to simple stressful situations, frustrations, etc. It has certainly worked for me. I no longer explode on perfect strangers who block my entry at the local Mobil station or the poor property manager at my office, or H or the kids.
Do you have a Catholic church nearby or a local YMCA? They often have facilities that offer therapy on a sliding scale based on income. It may be worth looking into just so you have another outlet, even if it's only once a month.