There seems to be an increasing number of non-academic articles, essays and books that are expressing the idea that the Serotonin hypothesis of depression is flawed. It seems like the drug industry just picked up this idea in the 70s and has been running with it (to the bank) ever since Anecdotally, I have come to believe that SSRIs have a temporary mood-altering effect, possibly combined with a placebo effect that w…
Zoloft for example [1]:
> An increased risk of suicidal thinking and behavior in children, adolescents, and young adults (aged 18 to 24 years) with major depressive disorder (MDD) and other psychiatric disorders has been reported with short-term use of antidepressant drugs.
[1]https://www.drugs.com/sfx/zoloft-side-effects.html
On a personal note, I am very sorry for your loss.