history: I've trained very hard, so I believe I will be fine in a 5k race I have next week. I've trained very hard_comma_ so I believe I will be fine in a 5k race I have next week Well if you trained as hard as you stated_comma_ I am sure you will do great!
current: i certainly hope so,  I will also rest before the race and eat right to improve my odds of doing well.
next: Sounds like a great plan. Good luck!