You are so right Karen. I'm quite sure that hypersensitivity to the sun is possible with all of the citrus oils. Here are a few more guidelines.
Cautionary Guide:
Never take essential oils internally. If essential oils are swallowed in any quantity, consult physician immediately.
Pregnant women should consult a doctor before using. Essential oils should be kept out of reach of children, preferably in a locked cabinet or container. Undiluted essential oils can cause skin irritation.
Before applying them to the skin, its recommended you perform a patch test or dilute them with carrier oils. Discontinue use if redness, burning or irritation occurs.
If essential oils come in contact with the eyes, flush immediately with cold water. Consult a physician if irritation or inflammation persist.
Never consume undiluted oils and cook only with those oils approved for food use.
Epileptics should refrain from use.
All pure essential oils eventually reach a point when they lose their fragrance and therapeutic properties.
Most will last over a year, and some, like patchouli will actually improve with age. To prolong shelf life of your oils, keep them sealed tightly in dark bottles and store in a cool, dark place.

Happy Blending.