Exhaustion for me too. The pattern for me is:
Day 1 - wake up and decide to stay in pj’s
Day 2 - wake up feeling worse. Don’t even try and do anything. Stay in bed.
Day 3 - depressed or mixed with SI
For me, deterioration is very quick and it’s very important that I start prn’s on Day 1. I also must get dressed and make the bed on Day 2.