Is this depression or what?

This last year i've been feeling very bad. It doesnt happen all of the time but the days that it happens I really wish to dissapear... I've been in a tratment with a psychologist because I suffered from anxiety and panick attacks for several years. He ures that I'm not a depressive person, or that I had any other condition than anxiety. I can be fine for weeks, but some days like these 2 past days, I start feeling a deep ache inside of me, and that is combined with some anger, with anguish, desperation of getting rid of that ugly sensation, desperation of feeling happy, in peace... And the biggest trouble is that I start fighting with everybody, I start seeing huge deffects and problems in the persons that I love the most, specially my husband, my son, my parents. Then after I start a discussion or when I hurt them, I feel like crap..I consider myself an intelligent and conscious person, but when this happens to me I feel I'm going crazy. I could say that a few years ago, when i had problems. I reacted in a normal way, i got sad, or a bit angry, but nowadays, those feelings are like 5 times more intense, and they are destroying me. My self steem, my marriage.But, there are only few days that this happens. Then, the other part of the time, I am ok, I feel strong, I feel comfortable. I have a relative normal life, I have my issues, my frustrations as everybody else, problems, but nothing that terrible.. I think of my self as a normal, conscious, intelligent, good person. But these days I would only like to dissapear...