I have had glasses for short sight since the age of 6, and have always had astigmatism too (worse in left than in right eye). In general I've had no problems with screens till recently (I'm 68 now) except problems caused by poor contrast. Among other things I used to work on accessibility for websites; it is bizarre to me that all the lessons of accessibility have been forgotten - websites were once regularly tested for accessibility, including readability for the colour-blind, and many used to display little 'stickers' to certify the level they reached - but now light grey text on white is normal and unquestioned almost everywhere (including this site). This makes text almost unreadable for me; I have to bump the font size up much more than I would otherwise. I don't get on with dark mode either, even if the contrast is ok. I have no idea if any of this relates to astigmatism.

Astigmatism can change with age so maybe you should check if you need new glasses, it might be that your astigmatism has changed.

Last thing - I've found floaters on a small scale come and go with age, they've never bothered me much. But if you have a sudden increase you need to get it checked - it might be a retina in the process of detaching.