This is a great topic. I lost my FOC (Father of Choice) suddenly & unexpectedly on 9-24-16. I'm not close with my biological father, and Bill was my friend & father figure. We were very close and I'm absolutely gutted.
i have never cried so much in my life. I have cried (at least once) every day since then and I wonder the same thing as you stated. And I'm already on antidepressants - of course my experience might not be generalizable as I have been on them for years for depression & anxiety. Been on a stable dose & functioning just fine til Bill died. My experience with using meds to treat my depression is that they aren't happy pills that take away feelings. They take the edge off enough so I can function and find constructive ways to deal with the feelings.
Since Bill died, I have had waves of crushing grief so painful that I feel like my skull will just shatter into a million pieces. And I do cry every day and I wonder, am I crazy? Am I in a classic depression despite the meds and don't realize it?
But in my heart I don't think so. I'm taking care of myself and doing the important life stuff, and getting lots of support so when I can look at this with perspective, I just think well, I'm grieving the most major loss of my life so far, and this is all part of the deal.
its just hard, no two ways about it