Hi, Amandine,
Welcome to Tinnitus Talk! We're a great support group, and, as Marlene says, you're never alone if you're a member. Sorry you are facing this alone; the doctors are often not very helpful to tinnitus sufferers. There are many suggestions on this forum for things you can do to help alleviate your tinnitus concerns.
First of all, it's best to keep some background sound around you at all times. Do you have an Ipod or other device that you can use? Or a sound machine? Nature sounds or soft steady noises really help, and they will help you at night when you're trying to get to sleep, as well. We have some great sounds posted on this forum that you can use. Go to the Tinnitus Talk Audio Player on the main page of this forum, and click on it. You can test the various sounds to see which ones might work best for you.
Another thing you can do, when tinnitus gets really loud, is to change your environment for awhile. You may wish to go outside and walk, or just go somewhere where there are other people. It really helps distract you from the tinnitus, and you will come home feeling better.
There are various kinds of supplements you can take that may help, such as gingko biloba, magnesium (I take magnesium chloride), N-acetyl cistene (may be misspelled), and melatonin. If you are really depressed, you could go back to your doctor and request a prescription for an antidepressant, to take on a short-term basis. Many people do this, and they say it really helps. (I've chosen to go the natural supplements route myself).
Distracting your mind really helps, too. Try finding an activity that you enjoy that will cause you to focus on the activity rather than the noise in your head. That could be anything from reading to working puzzles to knitting -- whatever works for you.
Other people may have additional suggestions.
Good luck, and please keep us posted on how you're doing. We care, and we understand!!