Wendy,
You've received a lot of great information regarding second opinions and treatment options from the group. Please follow through with second opinions and be as aggressive as possible with the treatments.
My advice would be more towards how you being a mother and expecting again and your husband. Set up a support network using family and friends for support. I cannot imagine how stressed you are at this point. Just thinking about your situation of giving birth while your husband is dealing with the effects of his treatments / surgeries and still trying to be a mom to a three year old overwhelms me.
Get things in order as soon as possible. Insurance / transportation / etc.
The timing is terrible, the surgeries and treatments are tough, sometimes the long term damage is unavoidable, but the battle can be won.
Good Luck