Hi Karl, I think a lot of us here can relate to how you're feeling. I have no way of getting inside your head and listening to your tinnitus (obviously), but from your description, it sounds like your T is on par with a lot of people's here (myself included). I think your original T was very mild (you stated you could only hear it at night) and so this increase is particularly distressing to you. My T started just how your current T is. It started with a cold/sinus infection. I thought my life was over. I had suicidal thoughts. I just couldn't imagine a life where this would be OK. I remember breaking down during my little girls 3rd birthday party, feeling so sorry for myself.
But time is a magical thing. I don't buy into the "time heals all wounds" thing, but it certainly smooths them over. Your brain WILL adapt to your T increase, it just needs time. As wonderful as our brains are, they're not designed to quickly adapt to new stimulii. They find them very distressing, and as they should, as a survival mechanism.
I know that nothing I am writing here will make your pain go away, just know that even in your darkest moments where you feel completely alone and giving up - I guarantee you 100% that there have been millions of people currently and throughout history that felt EXACTLY as you do in that moment, but managed to persevere and fight on. This is my wish for you. The end to suffering is not one magical instant - but rather a resolve keep going DESPITE the suffering.
Please feel free to message me if you are feeling particularly down. I would be more than happy to give you my personal contact info so that you can speak directly with someone who has gone through exactly what you are feeling and has come out the other side. You are not alone.