You can use Cheat Engine to alter the ID of one item to another. So you can change a few arrows or a broken sword hilt into a Fire Keeper soul.

If you're on console, there's no way to fix it, but you can play around it. Get the remaining ones you can, only level Vitality enough to heal about 80% with one Estus chug, then put the rest of your points in Endurance, which will increase your carry weight, allowing you to wear stronger armor. Next, find a good shield and adjust to a block-heavy play style.

Or, if you want to challenge yourself, do Vitality per above, but only put enough points into Endurance for you to roll two or three times, then put most of your points into Dex, Strength, Int, or Faith, wear no armor, dodge everything, and be a glass cannon.