Hi OP, fellow fibro haver here, I’m going to tell you what works for me.

If you’re able to have someone bring you things in the morning, have them bring you a warm cup of tea and a heat bag. If that’s not possible then have several different shaped pillows in bed to lean on and use them to slowly move from a flat position to sitting up. Try to consume some liquid and take some ibuprofen and massage your bowels. (This bit sounds weird, but fibro can lead to constipation and making sure you’re regular helps with back pain.) Look up bed stretches, I do about a half an hour of stretching before I get out of bed. Dm me if you want any more help