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allergies
Definitely not cheap, but I thought he was good, Dr Serge Baron Perin:
http://www.lacambre-medicalcenter.com/wp/dr-serge-balon-perin-md-nutrition/
It has been a while, but i think the appointment costs 80 euros and you might see him at least twice. Once for the original consultation and most likely you'll get blood tests, so you'll have to come back again to have him give you the results. Then is up to you if you want to continue seeing him or follow his advice based on the lab results.
He was recommended on this forum before:
http://www.xpats.com/allergologist-5