I note that you have had noise-induced tinnitus for 5 years
@ploughna. Since I don't have a full history of your tinnitus, my advice is based on my experience with noise-induced tinnitus and people I have corresponded with that have it. If you previously habituated to tinnitus and it has got worse over the years, in most cases (but not all) the reason is further exposure to loud noise or listening to audio through headphones. More about this is explained in my thread: Can I Habituate to Variable Tinnitus?
I believe you are overusing hearing protection which has resulted in lowering the loudness threshold of your auditory system and making it more sensitive to sound. It can cause the auditory system to react in peculiar ways that you have mentioned. I suspect the underlying cause of your oversensitivity to sound is hyperacusis. This can be treated with self-help or being under the care of an audiologist that specialises in tinnitus and hyperacusis management. Please click on the link below and read my post: Hyperacusis, As I See It.
Spikes usually (but not always) affect people that have noise-induced tinnitus. They are an indication that the auditory system is oversensitive and needs to be desensitized, either with self-help or under the care of an audiologist. The treatment can involve counselling and wearing white noise generators. Some people that have recurring spikes, there is a risk of the tinnitus increasing, so please try and get some treatment.
All the best,
Michael