I too wear a hearing aid and suffer from Tinnitus - big time - Tinnitus comes and goes - I never associated it with the hearing aid though.
Tinnitus is an awful thing - but can be caused by stress, medication and silence -
Got a new hearing aid last week from NHS as I have been buying mine for a long time ie £2,000 etc - no more - anyway there was a notice on the door (for Belfast) there are Tinnitus clubs you can attend - look up internet and see if there are any near you. Good luck Conne - hope that advice helped you a wee bit.