Yeah, well, not in shape, rode hard, paying your dues now. A good strategy is to buy a set of Performance rollers and learn to ride them. Then get up 1/2 hr. earlier and spend that 1/2 hr on the rollers, every day. Just ride easy with a big fan so you don't get stinky. You'd be amazed at the difference.
But for now your body is telling you to rest it. So do that. Ride when your legs feel better again. Problem is that you can get into a boom/bust cycle and that doesn't help your fitness. Better to do less more frequently until rides like you just did are not particularly noticeable.