R.W.
Sounds like the doc is just doing his job. Sometimes I think they forget what it feels like to be on the other side of this kind of call! Try not to worry. Ultrasounds are so hard to see sometimes, and they always try to be extra cautious with babies because they are vulnerable. A friend of mine spent much of her last few weeks of pregnancy in the hospital because the doc was concerned about the baby's heartbeat (they couldn't get a good reading, so they feared it was irregular). But her daughter is just fine, and they think she was just moving too much in the womb when they tried to listen to her heart.
If you are really so stressed, call and insist on a quick appt. and if they stall you, you can always see another doc. Stress is no good for you, or the baby, and you can tell them that!