Here are a few things to consider:

Do you normally get increasingly suicidal in the winter months? If so, you could be feeling the effects of the changing of the seasons on your mood. The days are shorter, and we don't usually get outside as much. Or you could be feeling the pressure of the holiday season.

Are you feeling more suicidal now than you did at the same time a year ago? Has anything happened recently to add to your stress? Don't discount the cumulative effect of small stuff. Anything in your daily life or in therapy that maybe triggered something?

Do you have a plan to commit suicide? Do you have the means to commit suicide? Having a plan does not mean you'll go through with it. Getting the supplies and working out the logistics of how to successfully commit suicide is a definite reason for calling your doctor and getting an appointment ASAP.

If you're somewhere in between and therapy isn't helping much or you don't have access to therapy right now, I advise you to call you doctor and get an appointment in December. The sooner, the better. Perhaps she can augment your medication therapy (add something new or increase something you're already on) for a few months until you get through the holiday season/winter.

I would call now so that you can get in before the end of the year. There's no point in letting something get really bad before addressing it. JMHO.

PS - If you're feeling like you may be suffering from SAD and can't get yourself to spend a lot of time outside, buy a super bright light and sit by it for about 15 minutes a day. It doesn't matter what kind of light it is. It doesn't matter what part of the spectrum the light is -- warm, cool, daylight, etc. It just has to be super-duper bright. I think you can get something called a Happy Light for $45 at Walgreens. It puts out 5,000 lux (a measure of brightness). More expensive lights put out 10,000 lux. I think 10,000 lux is standard for SAD therapy, however people can benefit from the 5,000 lux ones also.