2002 Vauxhall Corsa Am I being ripped off?

In july this year my car started overheating and I found the coolant was empty, upon taking it to the garage I was told that the water pump was broken and has to be replaced. The garage checked the engine and said that there were no further problems. Two weeks later it overheated again, upon taking it to the garage I was told that an engine coil had gone and needed to be replaced and that the water pump had come loose due to the vibrations of the engine. The coil was replced. Last week the oil light on the dashboard come on and when taking it to the garage I was told that the oil pressure switch was leaking and needed to be replaced which was done. On Sunday the car started overheating again, I checked the coolant which was empty and the oil had emulisfied. Took the car to the garage on monday and have been told that the head gasket has gone probably due to a deteriation when the water pump originally broke. All these repairs will cost me close to 1000 pounds. Am I really unlucky or do you think that something else is the cause? Thank-you very much for your help,
Mairi in Glasgow, Scotland