If you pause the game (or the low hit point auto-pause kicks in), you can hit a shoulder button to bring up a menu similar to assigning button functions. From there you can use food, potions or cast any spells that do not need a target.
If you visit the alchemist in the village, you may have the ingredients and formulas needed to make some more healing potions.
The text is a little small on my TV, but not enough to make it hard to read (except for red text, but that is more an issue with the TV).
Welcome to the forum.
