Hi OJazzy1. Congratulations on going to nationals.

Even when you're training hard the same rules apply for food intake, it's all about caloric expenditure. If your mileage goes up you'll need to eat a bit more if you want to maintain weight. What you might need to do is change how you eat. Making sure you get about 200 Cal into you within 20 min of a hard workout helps a great deal with recovery and that's important when you're doing a lot of hard back to back training days.

As for training plans, there are a lot of them out there. What distance is this? How much experience do you have? Are you willing to pay for a plan?

There are some good plans available on this site but you have to be a paying member of the site to access it.

Then you could always hire a coach and get a personalized program.

Good luck to you.