Yep, I'm a member of that club as well, though not by choice.
I would say in general just try not to take on so many things at once that you don't retain anything. Try to focus on specific areas and repeat them over and over and over and over. Especially with chord changes. Your brain may know what chord your supposed to go to but the key is to get it into your fingers to where you don't really have to think about it so much.
I don't know how long you've been paying, but I'm assuming that because you said you can only do one strumming pattern that you're fairly new-ish to the guitar. If that's the case, then mainly work on things like the basic open position chords and barre chords. Set aside a certain amount of time to work on each chord individually or pick a small group of 3 or 4 chords and work on
only these chords. Maybe learn a song that only uses these 3 or 4 chords and work on it for a good length of time. Once you feel really comfortable with these few chords, then move onto another group of chords. Then of course, also set aside some time to work on the ones you have already learned otherwise you'll forget those while you're learning the new ones.
When you can play chords individually without having to stop and think about where to put your fingers then you'll be more likely to be able to use them easily in a chord progression.
Take the same approach to learning new strumming patterns. Learn maybe one or two new strumming patterns and work on them over and over. Work at it in small chunks and I think you'll find that more of it will stick with you.
-tkr