All good advice here so far. Like everyone said, don't stress out because this happens to everyone, and it won't be the only time it happens, either.
One thing I do when I hit these walls is switch up what I'm doing. If I'm learning chord transitions then reach the plateau, I stop and start working on finger picking. If that stalls, I move over to strumming patterns and techniques (chunking, fan strums). When that gets old, I try doing things like practicing moving up and down the fretboard with tablatures.
Shifting from one technique to another not only allows you to process what you just learned, but also ends up incorporating it into new skills without you realizing it. You may think you're not using chord transitions when practicing strumming, but you are.
Not only does this take away any of the dull repetition, it really does wonders to enhance your whole playing ability.
And, as always, remember that this is supposed to be fun. So enjoy the process!