Writers block and Depression

I got a question, I have been pressuring myself for weeks now, I have deadline in months. I felt like I did nothing and fell into a dark pit of static and depression. I see the deadline coming towards me... need to create 10 worlds, and a whole plot. I am stuck, I took my remarkable but nothing... no words, no feelings... it feels like I am crashing into a wall. Voices, ideas, static... its plaguing my mind. People make stories and writing through it, I feel self-consious about it, I still have nothing at all. I feel nausious, I feel stressed out while my publisher asked where the 250 pages went.