I have two sons who are exactly 2 years apart and getting used to the new family arragement took some time. It has been about a month for you now and dont worry, it will get easier. The part of beign a mommy to two sons was the concept that both of them would be happy getting my attention at the same time. Mommy-sharing never deemed to me as possible,lol. When I was carrying one son the other would tell me about his day and we would share a snack or play outside.
A tool that I could not do without was my sling, invest in one. Also, put them both on your lap. When the second child got older, we three would all sit on the sofa, them on my lap, and we would just talk. Remembering that now, I can still feel that "group hug' sessions.
Get creative and give yourself some flexibility. If baby is still gassy then maybe cut back on your milk intake for a while, that was problem for one of my children. Consult a lactation consultant. I am not sure the crying it out idea would be effective at this age, try it after maybe six to eight months when the baby can learn to sooth herself; then again putting her down for a few minutes (2-5) wouldnt be harmful to her either.
Enjoy this new stage of motherhood and know that many moms nearby you would be willing to help too, if we are humble enough to ask.
Hope to help,
M.