No there isn't!
If you have such a bad reaction to henna, your body is telling you something
and you should listen. A lot of the so called "natural" hair dyes claim to be hypoallergenic (Madison), but once you used them you'll find out they are not. Chemical dyes don't sugar coat - they're bad too!
If you must color your hair, go for the least damaging option that doesn't give you blisters, rashes, or worse - hairloss!