Aching burning ankles... help!

Overuse injury, rest until it doesn't hurt. Decrease load. Build up EVEN MORE SLOWLY. Ice. Stretch (after it is done healing). Especially stretch calves...like many ankle/foot injuries chronically tight calves can be a cause.

I'm just coming back from similar injury. Now, I wear shoes with more support. I also stretch my calves and feet a lot. Swimming can aggrevate foot there also.

Sounds like could be the beginning of PF. Speaking from experience I'd say ignore this at your own risk. Stretch a lot- before after and during the course of the day. Ice- a lot. Check your shoes. Make sure they are max cushiony. And I'm pretty sure you don't want to hear this but consider running less distance with more frequency. Good luck.

what running shoes are you wearing?

to me, it sounds like you have weak arches, and you will have to strengthen them.

I know this may go against the grain of some advice, but you might consider trying SuperFeet Orange insoles.

(the SuperFeet Green are a bit more stiff than the Orange).

As you develop your mileage and are running without ankle pain, then you might try substituting the original insoles and run a small percentage of your miles w/o the SuperFeet. Gradually building to running 100% on the original insoles.

Also how are you striking ? if you are heel striking, try to move to a mid-foot strike.
it will reduce the ankle stress.

I had same issue and completely solved the problem with a refocus on technique. I land with a midfoot strick and started to get sloppy, with a small heal strike and my ankle didn't like it. So I slowed down and refocused on landing midfoot. . I use chi running and re read the book and worked on his drills. Now when I run I focus on the key points of chi running and it's awesome again.