Wow. I am sorry you are going through this.
I don't know what to tell you other than If you aren't learning from the class then take matters into your own hands and learn it yourself.
You have a computer don't you? USE IT!
There is an enormous amount of information on the WWW that you can use to get through this class.
Also, visit this site www.standardeviants.com
I self taught myself calculus, of all things, just by watching these videos and tested out of the class and I hadn't ever taken pre-calc or trig or anything. They have anatomy videos and yes, they are cheesy, but that is what makes them amusing and keeps your attention.
Furthermore, everything this professor says in class can't be a total wash, so read before class and then get what you can from lecture and then go home and review. Read. Read. Read.
Then go online and use google to search for things you don't understand clearly.
I am a firm believer in a positive attitude and with it, you can get through anything.
Oh and I'm sorry, but I must say, shame on your wife for making such a statement! At least you are trying.
Good Luck and keep your head up.