My cat is 8 months old now. From a few days it has started eating less and less and starts meowing in bass kind of voice. It sounds like the words "AAO AAO". and it seems like its in pain. So I patted her back and she kind of spread on the floor giving me the signal to go on (Normally she starts biting my fingers if I do so). It apparently gave her relief. One more thing I noticed is that she totally spreads on the floor when I pat her and emits some low sounds when I massage her back(which seem like the sounds we emit when someone is massaging us) and squats on the hind paws which she continuously moves as a pose of walking.Please suggest me what to do.I can also see a drop of urine on her uterus.