Wikipedia has more on Cnidophobia
Cnidophobia (from Greek cnido meaning "nettle") is the fear of stings or of getting stung by it. Cnidophobia is most commonly triggered due to getting stung by a bee, wasp, stinging plant nettles, or even needles used in medical procedures. Sufferers seeing things that can sting would provoke bad memories and will result in physical symptoms like headaches, nausea, dizziness, or panic. It is treated using panic treatments or psychotherapy.