Welcome to PC Zena. No need to apologize for your English. It's great! I don't know where you're from but your post reads as if you were a native speaker of English.
As for the ADs I am no expert but my understanding is that some people need to take them for the rest of their lives, particularly if they experience recurring depression. A doctor explained it to me by saying that the risks of recuring depression (the debilitation, suicidal thoughts and actions etc) far outweigh the risks of medication taken to keep depression at bay. That makes sense to me.
My brother-in-law has taken ADs for over fifteen years. He still experiences some depression but nothing like what he used to have (according to my husband). It's just a relatively small dose that is increased occasionally when things get bad. He seems to be doing really well.
So I guess it's a matter of weighing up the odds.
I don't know about the way you're feeling most of the time. Maybe you should speak with your doctor about the meds you're taking. Are they the right ones? The right dose? On the other hand I think our skills can deteriorate over time. I started doing puzzles again recently because I just don't feel as "sharp" as I used to. Sometimes when we're not using skills they kind of seem to disappear.
BTW I love architecture. You have a very interesting career. Best of luck to you.