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Kitchen floor

I have a kitchen floor which has definitely become warped due to the weather etc.. there is a big bubble-type hill right in the middle of the floor, always catches the pantry door which I then walk straight into. What can anyone recommend? There is also a fault in the thermostats in my oven, top two large elements only go on high, and the oven itself seems to burn rather than cook, or it looks cooked but still raw inside. Can anyone help here? I also have a problem with lightbulbs constantly going out. Not blowing so much as they are energy saver ones but just not working anymore. I have a two-storey home with most of the problem upstairs. Is there a common reason or do I need a sparky in to check out all my wiring?