Hi Portia,
Tinnitus will not kill you. Once your mind acclimates itself to the noise, it will dismiss it as benign. It will take some time, but having a 1:1 session with yourself in the mirror is also a good idea.
However, not getting enough sleep is detrimental to your health. I am currently battling middle-of-the-night insomnia myself. It is not fun at all!!