First off, don’t worry about the carbs. As a distance runner, you need the carbs. This nonsensical fear of carbs is bad enough in non-runners but it is much more detrimental for runners.
As for low-cal options, you could always start with water. It’s amazing how much that can do to quench those “hunger pangs” that people often think they feel when they are actually feeling need for water. However, right after a run, it’s actually a good idea to consume some carbs to replenish your glycogen stores.