Tiki, you are not a burden and you need to stop that thinking! Every person alive is so special in their own ways. You are too. You are just trying to handle everything...including chronic pain.
If your husband doesn't have a job, is he pitching in and helping you with the house? That would only seem fair. Actually, if he did find a job quickly, you would have less stress so you would have less pain. So, don't be so hard on yourself and so easy on your husband.
With fibro, you have to learn to pace yourself. The work will get done but not in the time frame you want it done. I only can do manual labor for a little bit and I always do it in the morning. That is when I have the most energy. I will sweep and mop the floors one day, dust and vacuum the next day, clean the bathrooms the third day, etc. It all gets done eventually. If hubby complains, hand him the vacuum. He is capable of pushing it...probably better than you with the muscle pain you have. But, I think you've got the picture.
Be sure to take some time for yourself. I know it isn't easy having a baby on top of fibro, but many here have done it. My children were 13, 10, and 9 years old when fibromyalgia struck. I didn't have to deal with babies. We just had a new member join us that has 10 children! It's amazing what the human spirit can do when it needs to.
So, the bottom line is, you are not a burden to anyone. You need to just pace yourself and not try to do all that you used to be able to do. I hope this helps and I hope your husband finds a job soon. I think that is taking a toll on you.
Sherrine