It's not surprising you feel a mess with all that's happened. If HR can't get their act together and give you the support you need, then if you are unable to work effectively, then you should go back to your GP.
Your wife also needs to know exactly how things are. More than ever, you need support and understanding of your family and friends. I hope the emotional side will get better, but living with incontinence and impotency and still being on treatment can't fail to affect you. If work can't help, then it doesn't say much about them as an employer.
Hope you get the help you obviously need.
Paul