Seeing you say, "I look back on my dark days just a couple months ago" leads me to believe that you are starting to move beyond those dark days. Which means there must be something other than dark days ahead. And as the dark days are left behind you can reflect on the times when they were still here and remember the pain from that time. And it's okay to feel that pain. Because feeling the pain from those memories can be a tool. While remembering that pain from the past and noticing where you are now you can feel yourself move beyond those old pains. That's when you may begin to see all the new things that you hadn't discovered before.
Keep your head up, Billy!
Thanks @etblink for your insightful words and encouragement.