Pain in the butt

I have ridden Selle Italia Flite saddles on all my bikes for the last 15 years. This is the first time I've ever had concerns about pain. It's not saddle sores but just general discomfort on the seat bones from spending long days on the bike. The bigger concern right now is my tail bone. It is very uncomfortable. It hurts when I push a big gear or when I'm seated and really powering up a climb. It hurts more when I have to get through a hike a bike section or climb stairs. I'm trying to just deal with it because I really don't know that I want to make a big change like swapping a saddle 2 months before the start of this thing. I full on expect to be in lots of pain after 10-12 hour days even if I strapped a pillow to my saddle.