I don't know where in the city you live, but ALzein pediatrics in Evergreen Park and oak Lawn is rated in the top five in Illinois. Very accommodating, staff is nice, all the docs have been great. I nursed both my kids and had good feedback from everybody. I went to them because a doc i tried a doc who wasn't supportive of nursing, dumped her immediately!
As far as sleep issues, babies your little one's age wake frequently at night, especially at night. This is NOT a symptom of a medical issue, its a symptom of a baby. There are lots of sleep training methods that do not involve crying it out. Sleep is extremely important to brain development which explains the doc's interest in making sure your baby gets some. A rested parent is a safer parent. Also a good reason for your doc to take an interest. Sleep habits learned now carry over to childhood, and into adulthood. I am not suggesting you let you baby cry, even though I did at this age and had excellent results with my first, (didn't work with my little guy, but neither did anything else!). As a parent I would suggest you find a sleep method that works for you.