My 3 yr old has constant rashes, creams don't work. I am getting frustrated with her doctor. What do I do?

For the last three summers she breaks out with rashes on her back, neck, face, arms, etc. But none of these places all at once. It usually starts small and spreads. She digs at her ears until they bleed, but she never has an ear infection. I have had her to the Drs repeatedly. They have tried Singulair, multiple creams, and preventative lotions. They did a first step allergy test, which was negative, but they wouldn't do the second step allergy test (injections under skin) due to her age. This last time to the Dr, they suggested preservative free foods and a fungal cream. Why would I do a special diet if she only has this in the summer? Why wouldn't they do the rest of the allergy test? They also told me to mix alcohol with vinegar and wipe her ears with it, it burned and she screamed. I can't keep putting her through this. Has anyone else dealt with anything similar? Any thoughts? Oh, and the fungal cream has clearly printed warnings that it is not for use in under 17! Help!