In reply to ianstevens:
I think the evidence is inconclusive at best, but that doesn't stop people having strong opinions either way. Judging by the number of people wearing them at races, I'm (as a non-wearer) in the minority.
To the OP - if you're upping distance and intensity then your muscles will naturally feel more fatigued. Its part of the training process.
That said, they're cheap enough (Decathlon do some) so if you want to try there's not much to use. However I get bad enough comedy tan lines with my socks in summer so god knows what I'd look like if I wore compression socks.
I wear compression shorts on long runs, but to be honest that's more of an anti-chafing measure than anything else. I've also got some compression tights that I wear after really long efforts, but to be honest I'd be hard pressed to know the difference between days when I've used them and days I haven't.