Randy, it sounds to me like you are fine but you should always talk to your doctor if you are worried.
Perhaps your surgeon and mine went to the same school. Like you, my big sore spot was under my left shoulder blade. Many people have difficulty sleeping so it is hard to do more than suggest possibilities. If you are stressed and anxious, that in itself is enough to cause problems with sleep. The medications you are taking can also prevent sound sleep. If you search for sleep issues, you will find that many of us have experienced changes in our sleep patterns. I've never had a problem going to sleep but since the AVR I wake up around 4:30 am almost every morning before usually going back to sleep.
One thing that can help improve sleep is walking frequently throughout the day. You are now approaching three weeks which is an important milestone because the internal incisions should be healed by then. I found that my my chest incision healed but my drainage holes were slower. At three weeks, hopefully, you will be able to walk more which will help get you back into a more normal routine. During my first three weeks, I found I needed a lot of naps but after that stamina began to return.
Oh, and the body temperature thing! I have yet to hear someone tell me why this happens. When I wake around 04:30, I am also sweating and feeling hot even though the room temperature is lower than at the time I went to bed so there must be some issue with thermal regulation at play. I will say that the sweating has improved but it is still happening to me two years after surgery. My cardiologists says it is pretty normal and nothing to be concerned about. You will find that a lot of our compatriots here in VR share this issue.
Be patient with yourself, Randy, you are just starting your recovery and you are recovering not just from surgery but from all that time you lived with the bad valve. Your body has a lot to adjust to now that blood is flowing more normally from your heart. You will feel better in weeks but you will notice changes for many months.
Larry