Thanks for the reply! It is reassuring to hear from someone with almost exactly the same symptoms. I've had general anxiety for several years now, and it's mostly under control but some things do tend to bring it to the surface again! Even though I've just been getting this noise in my ear maybe once or twice a day for a few seconds each time, it has been really concerning me. I've had it for a few weeks now, and there's absolutely no sign of it getting any worse or anything like that, but my mind is constantly thinking "what if it worsens!"
I believe random ear sounds like that are fairly common though, and I guess a lot of people without anxiety wouldn't even give them a second thought!
The worst thing about it, ironically, is that the sounds themselves don't seem to bother me too much, but my response to the sounds does! I'm in constant worry every time I hear a little sound in my ear that it'll set it off again, but the logical part of me says "so what if it does? It lasts for a little while then goes away!" - I never listen to the logical part of me enough though