I started on low spiro only late last October and I did feel weak a little at first.
Certainly no depression since the changes to my body started right then and brought me joy.
I couldn't say about insomnia for I have a free schedule and go to sleep when tired, and besides going to pee every 2-3 hours because of spiro, my sleep was great as usual, same length.
my T was low before I started spiro, but still within normal range
I started E 4 weeks after and really felt the strength of the E flowing through my body, now I feel much stronger (than when I was T driven), but in a different way.
a little more than 3 months after, my E level was almost as low as a cis woman (72) and my E still not as high as needed but well on its way