For about six months now I've also been experiencing
exactly these things you describe. The spiking sounds, which typically last less than .5 second, tend to be glassy/metallic in nature (sometimes like the sound of knives sharpening), as is a large component of my overall tinnitus now. A mild generalised hyperacusis has also set in, which is a real game changer (I think the hyperacusis underpins this overall change in character of my own sounds).
Earlier this year when I visited the audiology clinic at my local hospital and described the sensation of transient spiking sounds that often make me wince, the audiologist mused that my condition "sounds like recruitment". I have to say that further research on the subject of recruitment actually just left me with more questions than answers.
I went on to purchase Neil Bauman's Hypersensitive To Sound book (the inexpensive download version) to see if there might be any answers there. I also corresponded with Neil by email. It was his view (and mine too to some extent) that my situation cannot be categorised as recruitment because it isn't accompanied by any severe hearing loss (I have noise induced hearing loss down to 35 dB @ 4 kHz in one ear and between 4 kHz-8 kHz in the other ear). What Neil believed I'm affected by is, reactive tinnitus.
I'd like to say something about reactive tinnitus. I don't believe reactive tinnitus is a condition all on its own. Instead I believe reactive tinnitus describes a symptomatic intersect between tinnitus and hyperacusis that may occur in some people affected by both of these conditions. Reactive tinnitus is something that's discussed quite at length in Neil's book, and from what I can now understand, in terms of management approach, the general consensus of opinion between the audiologists he quoted (and if I remember rightly Neil Bauman too) is that when hyperacusis and tinnitus co-exist, treatment for hyperacusis must be carried out first.
It's apparent from reading this forum that treatment for hyperacusis divides people. Some have had success, others state there is no treatment available for hyperacusis. I honestly don't know. I suppose it depends on the type of hyperacusis one has. It seems there may be a distinction between loudness hyperacusis and pain hyperacusis, with the latter potentially being more difficult to treat/manage, but not impossible.
@Damocles who's a good ten years into this, did say it is possible to habituate to our kind of malady. A comment for which I'm grateful. Go well, man.