Congratulations on the new baby. I think you have a lot going on right now, you are going to feel tired, just from having a small one in the house. I agree with Sherrine, you need to find a different job. Fibro and heaving lifting don't mix. You need to contact your doctor, he/she may be able to help you in some way. The best advice I can give is to look for a new job right away and get help at home so that you can rest up until you can find a better job.
I hope you find help soon!
Meggie