Too scared to go back up here, had found a bunch of spores moving around too when I entered. I have video versions too of these photos, but it looked like giant dust particles were floating around. Should I be concerned?
https://i.sstatic.net/cVyPu.jpg
That looks like standard cellulose insulation. It's not particularly hazardous.
We can't completely rule out asbestos from here. If the house is in the US and was constructed in the last 40 years, the chance of there being asbestos in that attic is near zero. However for an older house, without testing you should assume any dust could contain lead or asbestos. If you want to be certain you will have to test for it.
Regardless of the presence of anything hazardous, you should be wearing a dust mask when working in a space such as this attic. Going in unmasked means you'll be breathing at least a bunch of dust and dirt in. There's no reason to expose yourself to that crud. I have a half-mask facepiece I use with P99 filters when doing work such as being in the attic or crawlspace.
This looks to me like vermiculite insulation. (Little grainy chuncks that sometimes shine on some faces.) If you look it up you can read on it, but the gist is that not all vermiculite contains asbestos fibers but much of it does. I think you can have it checked to find out what levels you might have in it.
