@calicoday I’m so sorry to hear, I imagine some of what you’re going through, my mom has fibrio too, it’s a lifelong pain.
Dhamma is not about prescribing particular ways of meditating, but about helping people ease the pain from their lives.
The mini anapana session is 25 minutes with teaching, and then it’s only 10 minutes each practice. If you can, give a try sitting on your bed and if the pain becomes too much, you can finish it laying down. All the best to you, hope your pain goes away.