I didn't have to undergo all of those tests, so I can't give you alot of advice.
The one thing I wanted to stress to you and your husband is that the doctors should provide medication to help relieve some of the pain. If they do not, it is your husband's right as a patient to have his pain kept at a managable level.
I never like to take medications before my cancer, but it taught me to realize that the medications are there to make things easier and to take things when they are prescribed for me.
I wish you both luck and peace during these mind boggling times. I remember all of the tension and the awful waiting for results. Hold onto each other and keep hoping. It really does help.