Can't replace the CPS yourself? It's a dirt-cheap part and I would think it'd not only be easily replaced, but would also make the car run well enough you could ignore the other problems for a while. I'm almost certain your problems with the car not starting when hot trace right back to the CPS and I'm amazed that you're still fighting it rather than replacing this $14 part. You're causing more than $14 worth of wear on your starter.
As for the yellow film under the oil cap, not necessarily a blown head gasket. There are plenty of ways to check for the head gasket. Air bubbles in the radiator with the engine running but cold. The oil on the dipstick looking more like really wet clay than oil. Foam where there should be oil. Caused by mixing water, oil, and air.
It's normal to get some water in the oil just from condensation but driving the car usually make this little bit of water evaporate.
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