I have an infection in a piercing in my ear, why does my dr have me on both keflex and doxycycline? can these two make me feel like i have a cold?

Infections caused...: ...By foreign objects like piercing jewelry are often due to a mixture of bacteria, which sometimes requires treatment with a mixture of antibiotics. Many drugs can cause flu-like symptoms, but so can the interferon that your own body secretes to help fight the infection. Or, you might also have a cold!

Ask your doctor: Those two antibiotics both may attack similar organisms. Cannot comment on why doctor doing this unless know what he found on exam and cultures (if done). These should not be creating significant effects to make you feel like you have a cold, but strange allergic reactions do occur.