Heyo, I'm usually a runner too and just got into lifting about 5 weeks ago.

You said you did a Leg Press and Squat on the same day? Those are both pretty hard on your legs and hit fairly similar muscles, the training program I follow specifically splits them so that they aren't done on the same day. Plus those first time DOMs really hit hard usually.

Running will also fuck up your recovery big time. You might feel fine when you run, but the accumulated systemic fatigue really messes with things. Maybe consider replacing some of your runs each week with biking or the Elliptical (or cutting them altogether if you want lifting to be your priority)

Right now, the best you can do is some active rest, good food, and good sleep.