I'm not sure what is allowed in your plan but a trainer at one point recommended at least having a banana and some nuts before a workout in the morning because of the potassium/carbs in it and then a little protein, helped with energy and will help muscles recover afterwards. It would stave off any lightheadedness during and then afterward there were no serious hunger cravings either.

I hope this is going well for you. Small changes are lasting changes, building into it, and not to do too much at once. Good luck!