You might not have many options then, other than trying to get a better rate with your lender (perhaps fixed rate if it's lower than your variable one). Might not be worth fixing, though, as you might be able to switch in a year, when you get €40,000 to pay off the mortgage. Though it will depend on the value of your house at that time - if house prices drop further, paying €40,000 off the mortgage might not get you into positive equity.
In any case, if you have this lump sum coming, you are in a good position, as it will at least help you out until things improve.