Heat can cause increased swelling, especially in the 'acute' phase after an injury or surgery. It is not recommended until swelling has gone down. I had surgery in December and wasn't allowed to go into the hot tub until 8 weeks post op, and even then I had to ice immediately afterwards. I noticed increased swelling after being in the water.
Icing and elevating should help until you can get in to see your doctor.
Heather