As much as you probably don't want to hear this -
When the head gasket went on my 2002 Td5, the ONLY symptom I got was water loss. No oil emulsification (sp), no overheating, No Hydrocarbons in the water.
Its got worse until it eventually overheated very quickly, leading to me needing the head skimmed.
The garage said its common when the locating pins sheer.