Hi there,
From my own personal experience, I would call your pdoc's office back and see if you can be seen sooner, and yes, I would mention the suicidal thoughts.
Several years back, I was at the same point, the thoughts became more embracable (sp?) but the thought of leaving my child motherless and hurt brought me to my senses, the little I had left, and I called my therapist up and went there that day instead of the original scheduled appt. the rest is a long story with struggles, the outcome was successful (so far) I'm here and my son is now 20, I look back and realize now I would of missed so much, I'm glad I stuck it out and kept in mind that old saying, "and this too, shall pass" keeps me knowing and respecting this cycle, "today becomes the past, tomorrow the present, etc."
I send you many well wishes for innerpeace and future happiness.