WAY TO GO ON BREASTFEEDING!!!! YOU ARE DOING THE VERY BEST THING YOU COULD DO FOR YOUR BABY!! KEEP IT UP!!
Definately try the Gripe Water and some infant probiotic powder (both found at natural health food stores). Use only a small dose of the probiotic every other day or so to start. You can also take additional probiotic yourself. If the baby seems truly in pain, you are right in trying to start an elimination diet, usually with milk and milk proteins first (including whey and casein found in MANY items). Chocolate is a culprit often too. You need to give it 10-21 days to work completely out of your system before making any judgments as to whether your little one is improving. If no improvement, move to the next most common allergens/sensitivities which are usually soy, wheat, tree nuts and others....do them one by one to determine which ones seem to bother her or not.
I would strongly suggest consulting a lactation consultant such as Lucille at Morton Plant CLearwater. The service is FREE regardless of where you delivered and you can make an in-person appointment or get advice over the phone. She is absolutely wonderful and has seen everything! She has a food list that she can give you and evertything. Also - come to the Nursing Moms Care and Share Support group for infants held on the 1st and 3rd Friday of every month at Morton Plant Sarah Walker Womens Ctr from 10-12. Please come!!!!
Also - as for napping...definately get a sling. It is the most natural for an infant and promotes a onderfully cozy sleeping position for them. Also, use the swing or bouncer chair if she'll accept it or sleep next to her :-) Every new mom needs that extra nap and this is the perfect solution!!! Don't consider it a 'bad habit'...it is as natural as can be for a baby and you are right to provide for these needs! Don't push her away and don't worry, she won't be sleeping with you in college...enjoy it while it lasts!