Confusion, depression, life is a *****!!!!?

i've had depression now for a good few yrs, around 9 even do im only 25. my first experience was after i had my child who is 9 now. it always started with a panic attack and then the depression would set in, i was serious nervous all the time. eventually i strarted meds!! im taken them now about 5 yrs. i started on 20mg a day, about 4 yrs ago d doc put it up to 30mgs and i've been fine since. but last mon i was watch tv and bang a big panic attack and i havent been right since. it just came out of no where, i've antiexty all the time, is this just a thing that can happen and it will past. i also want to ask do you think that issues from the past that you dont even think about can reappear, do u think that dealin with my past might help me!!!!! no smart answer please!! only if you've had a similiar experience. thanks.