Hey again, Spoke to the vets. As we got a postal strike they didnt have any results yet. They said they only found a small lump on my cats head. But was still waiting for results. My cat was always running around and jumping around. Banged its head a fair few times, but got right back up and carried on playing. So maybe it could of been very bad luck, was playing with the other cat, hit its head and died. Who knows!
Anyways The monday night before my cat died, it acted very scared of one of its whiskers, cowered backwards and ran off. Just now my other cat has done the same thing, was playing with some string, then cowered and ran off. Is this a sign? Do i need to panic?

thanks again!