my new lack of sadness depression [View all]

Good morning
I struggle with BP2 and SAD.
Last year, I moved from NY to SC in part to reduce the symptoms of SAD. It worked. I didn't get overly depressed last winter or this winter so far.
However, I have been struggling with a depression that I have never experienced before.
I don't have feelings of sadness, failure, or despair.
I do have extreme fatigue, irritability, and exhaustion.
I can't get enough sleep.
I'm struggling with concentration, self-care, and eating.
"I feel an emptiness inside, to which I cannot relate".

I was wondering if anybody had any thoughts about what I am experiencing. Thanks in advance and Happy New Year.