Hi gaz,
I was diagnosed with type 1 last week on Thursday and I too have tinnitus, since a year ago.
My tinnitus is different to yours - I have pulsatile tinnitus, which means I can hear my heart beat in my ear constantly.
I asked my doctor wether they thought it was related, but they did not. (will let you know if this changes)
Sorry I can't really help you, but I thought you might like to know you aren't alone!
As for your tinitus, I've found doctors to be terribly unhelpful about it - telling people to listen to music and live with it... My advise is to keep bugging the doctors and to drown out the tinitus when sleepiing - put a fan on, or music or sleep with tv on or white noise
Incredibly sucky, but it makes it a little more bearable.
Hope your tinitus goes away,
Rosie