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I have a problem with my Odyssey (1999 3.5 v tec) when ever you are driving and come to a stop the temperature rises almost to the H on the temp gauge. This happens almost every time you come to a stop... not so much at short stops unless you have been driving for maybe 15-20 minutes the temp will go down if you start moving or rev it a little.. I also think it is warming up faster than before. The temp rises and falls rapidly that why I was thinking maybe the sensor is going bad, but more likely it is a problem with the water pump or water pump clutch. Have any of you had a problem like this? and if i need to replace the water pump or clutch how much would i expect to pay for it?

 
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Go the easy route first. Try replacing the thermostst. If it is sticking, or old it can cause some of those problems. If that doesn't work, then look into putting a new water pump in.

 
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I am afraid you have a blown head gasket and it is blown on the inside so you will not see a leak on the outside of the block.Take it to a garage and tell them what is going on before you do anything else.Also check the level of your anti-freeze.