My husband and I rescued a cat that is almost a year old. She had never been to the vet (not spayed). We made an appointment to have her spayed/shots but she went into heat before her appointment date. For the past week she has been meowing and howling and pacing - mostly at night. However, starting today she was begun to sink low to the ground while walking. She can walk normally but she is mostly pressing herself low to the grow and just kind of laying there. Is this normal, am I right to assume that she is just in heat or is this a sign of a serious problem. I have never had a cat go into heat before. Our appt with the vet is Wednesday, is there anything we can do in the meantime to help her?