I am taking ADs at the moment and have done a few times in the past.
This second time I was gutted to be going down that path again, but this time, I recognised the symptoms and went to GP.
I have had a few wobbles this time and will go back if they last any longer than a couple of days.
Use your knowledge as a positive thing.
Of course we will always have things in our life that push us to the limit and when suffering from depression it is difficult to distinguish the difference between life and a depression that needs treating. Either way you have made the right decision by making that appointment.
Like me I imagine that you know you will feel better at some time but your view is clouded at the moment. Keep going and slowly but surely you come out at the other side again.