I'm not sure about what sort of lactation consultants or breastfeeding clinics are available in Chicago...although I found this list, you could check out:
http://www.expectantmothersguide.com/breastfeeding/chicago.htmIf your lo also has gas, it could be a problem with the latch, and for that you'd REALLY do best to see a lactation consultant. At 3 weeks, your nipples shouldn't really be sore unless there's a problem. Here's also a link about suggestions for the latch:
http://www.kellymom.com/bf/start/basics/latch-resources.htmlAs for thrush, here's how to identify if you have it and treatments:
http://www.kellymom.com/bf/concerns/thrush/thrush-resources.htmlThe treatment for thrush is pretty straightforward if that's what's going on.
Aside from problems with the latch, there are other possible reasons your lo could have gas, but I can't emphasize enough that first you need to see a specialist to get the latch checked. Or at least read the resources and watch the videos if you can!
If the latch is fixed, then she'll start taking more milk in, less air and will be able to go longer between feeds and have less gas and discomfort - as will you!
Breastfeeding can be really wonderful when it works - sometimes it just takes a while to get the hang of it - both you and your dd are learning something new - contrary to what a lot of people think, it doesn't come naturally for all of us! Please keep me posted on how you're doing and let me know if you need more help.