My advice to you is to plan your runs. As Seige said, get enough sleep and dont eat right before you run. For me personally, i cant eat for up to 3 hours before i do a long run.
Also, pace yourself. Listen to your body. If you have the will, you will get better at this and get to know your body very well.
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'And it's been a long December and there's reason to believe
Maybe this year will be better than the last
I can't remember all the times I tried to tell my myself
To hold on to these moments as they pass'
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