Do you /have you in the past listened to loud music or attended loud events and concerts on a regular basis? The overwhelming cause for tinnitus in the modern age is inner ear damage caused by over exposure to damaging levels of noise. This is how I caused my own tinnitus (headphone usage at ridiculous volume) over the course of a few years, and I've now had pretty bad tinnitus for 4 years.
How you react to it in the beginning plays a HUGE part in how you will deal with it long term. Try your hardest NOT to focus on it and listen to it/compare it every day because every time you do this you are strengthening the neural connections to your tinnitus, making it louder and possibly permanent. You need to weaken those neural pathways by focusing on things other than your tinnitus, always have low level background noise on, invest in a sound machine if you want that plays different noises (I use mine at night for sleep) and a pair of 'sleep-phones', soft headband type headphones that you can sleep in comfortably. This will all help take your brain away from the tinnitus noise.
When I first got it I was convinced my life was over. I was depressed, lost lots of weight, had very black thoughts. believe me when I say most people learn to live with it over time. There is no cure at the moment but that may change if there is enough research. The problem is that it is caused by so many factors.
There are forums (tinnitus talk) but sometimes these used to make me focus even more on the tinnitus, so they may not be your best place at the moment.
After 4 years I am much better, I still wish I had my silence back, but I have learned to live with it. For those who have never had tinnitus at debilitating levels, it is hard to describe, but please don't think this is an easy condition to live with. Imagine having an alarm clock strapped to your head 24 hours a day for the rest of your life. There is no escape. Could you live with that? Can you imagine why some people can't?
Finally, try to imagine your tinnitus like a candle flame. In the day time, with all the other lights in the room, lamps, tvs, daylight etc, that candle flame is barely noticeable, just one light among many other lights. Now imagine that same candle flame at night, when it is quiet and dark with no other distractions around. That flame is suddenly the brightest and only thing in the room and you can't take your eyes off it. It' s the same with tinnitus. When you make it your sole focus, it can and does take over you life. The trick is to surround yourself with lots of other stimulation, low level noise, and to keep busy. The tinnitus flame with get smaller and smaller until it is just one light among many.
Good luck.