After a month's hiatus (brought on by equal parts pool cleaning and desire to sleep in), I was back at master's swimming this morning. The summer session runs for July and August, and unfortunately features one coach for a very full pool.
Most of the people who returned for the summer are serious swimmers, so I found myself in the second-slowest lane. Which was fine, because I was slow. We did 50m repeats, and by the second 25 my arms were rubber. There was just no strength in my pulls at all. I still managed to do do 50s in the 45-55 range (depending on how far into the session we were, and how much rest I'd had), and one of the guys I knew from the winter commented that I hadn't lost my speed. Nonetheless, the feeling of power in the water is gone.
The good news is that I'll be in the pool twice a week from now on, fixing that little problem. The bad news is that, with one coach for 30-40 swimmers, I'll likely be fixing my problems largely on my own.

Ooohf. The upside is that you know what it takes to get the feeling of power back, thanks to the good coaching you had earlier this year.
Yikes ... that's a really high ratio, isn't it? Our program here is one coach, and assistant, and about 25 swimmers.
Your power will be back in no time at all!
Hope the speed comes back soon. I know how tough that is, believe me.
You know, you probably had up days and down days while swimming. Any chance this was just a down day? Either way, you'll find that power coming back soon enough.
You'll get there. I know that you will because you've got it in you!
You'll be back in shape in no time, hang in there. I can hardly stay afloat with my limbs flailing all over.