Feeling exhausted? Rest for a while. Feeling drained? Take a break from what you're doing. It's okay to feel tired, it's okay to feel weak. What's not okay is giving up so whenever you feel the need to give up, give yourself time to recover and acknowledge the fact that it's okay to not be okay.
You'll end up wiser, stronger, and more capable once you overcome everything that's in front of you. Don't give up, just take a break and continue from there.