I have just started with a low frequency tinnitus, a week ago, that is there when I wake up. It usually lasts around 3 or 4 hours and is a low drone, not unlike a helicopter waiting to take off that is a couple of kilometers away, or even comparable to a cat purring on my shoulder. Sometimes I also have a frequency that is fleeting and two octaves above the low drone at the same time.Most of this, seems to be in the left side of my head. I have no explanation as to why this may have just started happening over the Christmas holidays, I have lived in a quiet forest for many months with no other real sounds present. Interesting to read these threads with so many sufferers; this kind of problem makes you think you are on your own! Obviously, that is not the case !!