Summerrain, sorry i did not reply earlier.
The answer to your question is that not, i don't feel tired because of not eating carbs.
In fact, for me seems to be the other way round. I feel strong and energetic in a proten based diet with no starches.
seems that my body works well on it.
Apart from running, i also do other sports like gym work, martial arts and swim and aerobic classes/dance and i feel perfectly ok without carbohydrates.
I suppose everybody is diferent, i sometimes have this joke saying that i may be a timewrap from an iron age hunter-gathered....................lol.
I consider myself a real carnivore who eats anything that swims, flies or runs..........................well, i feel healthier that way,