I've done this with Prozac and Citalopram (not tat the same time) and taken them at this time of day. Check your leaflet - it'll probably say, "take as soon as you remember but not at the same time as next dose" or some such. HTH.
Perhaps you should get one of those tablet cases from the chemist? They only cost a couple of pounds then there would be no doubt as you fill it once a week and can easily see each day if they have been taken.
Don't knwo what happens if you take too much but wikipedia say 'In 2001, the BBC reported the World Health Organization had found paroxetine to have the hardest withdrawal problems of any antidepressant' so no wonder you felt awful when you forgot to take them a while back.