Savvy
Rohag gives you some good advice. I wonder what type of dr. youre going to? an MD, psychiatrist? are you looking for medication? it sounds like it may be beneficial to get a therapist involved, not only for the depression, but to help bring the marriage back together.

As for your appointment, remember, the dr. is there to work for you. It may be helpful to write down all the things you want the dr. to know. I know i am afraid of dr's and forget everything once they start talking to me and then i have lots of regrets over what i didnt get the chance to say that i felt was important for him to know. so by writing it down in bullet point fashion is very helpful. I would just hand it to my psychiatrist. he found it very helpful and we would have never been able to address all those issues if we talked about them in the traditional way. he was able to pick out what was important and what wasnt. and i felt "heard". i once heard it said that you need to tell your dr everything important in the first three minutes because they stop listening after that.

so my best advice is to relax, be clear and concise, advocate for yourself, remember that you are in charge. be clear in your expectations of what you want from the dr. and take care of yourself. good luck