If you're asking about the monetary side of things and how you will function in your household... having great medical insurance and a really strong support network within driving distance of you does wonders.
My daughter is not in diapers, but she is almost 10 and was diagnosed with an autoimmune disorder that causes brain swelling and behavioral issues at almost 9. So for less than a year we have KNOWN what was going on with her, but before that, we didn't know and had no resources. Scary truth, but there it is. When she wet her pants at school, we took her clothes and comforted her like any child (though usually one of a younger age.) When she kicked me in the face and screamed and tried to run away, I searched online for ways to safely restrain her with my body so neither of us would get hurt. And when worst came to worst, she was in an outpatient psychiatric facility for 11 days.
We used up all DH's sick leave, I stay at home, we went from psychiatrist to psychiatrist, to neurologists, to Children's hospitals, and spent hours each day searching for answers online to what MIGHT be wrong. We brought lists of tests to our pediatrician for him to run, we sought out alternative therapies in Chiropractic, Nutritional Response Therapy, Bio-feedback type things, etc.
We asked family and friends for help. One friend came and cleaned 3 nights a week for me for pennies and trades (baby items, etc.) My mother-in-law would stay over 2 nights a week to help me catch up on dishes, cooking, and laundry and watch my younger daughter so she would have some one-on-one attention too. Every day was a doctor appt. Every night were tears on the pillow after we FINALLY collapsed from exhaustion.
It's not pretty, but even in the throes of it ALL, the total worst of it, I was thankful that she was FUNCTIONING on some level. That there was some hope. It took me 9 years to find ANY answers for her, but some people get the answer on day 1 and it's not good. I'm lucky I was dealing with something that was mild enough for 8 years to not have an immediate diagnosis!! Sure, it was torturous at times, but still! Nothing critical. You find your way. You find online and real-life communities, you learn to find great doctors and therapists, your life changes as your priorities change and you lose some friends and gain others.
You adapt and change and find your way through the experience of it. There is a reason behind everything and you learn from it and love your child and live day to day, just in a different way.
I hope this helps some, but like the others said, you are probably worrying for nothing. Take care of yourself, eat organic foods, stay away from chemicals as much as possible, rest as much as you can, and try to meditate to get rid of some stress and you will both be healthier and better for it.
-M.