Lysh- The brand name on the probiotics I used is Biogaia. I found them at the drug store in the baby section. They are expensive...$30 for a tiny bottle...but totally worth it if it helps your LO. You are supposed to give them 5 drops once a day. The instructions suggest using a spoon, but that is really hard with an infant, so I would just put a drop on her pacifier, let her suck on it for a minute and then repeat until all 5 drops made it in her mouth.
My LO was pretty gassy too...well, she still is, but she seems to handle it better now. We FF and BF as well. She eats so much (30 oz or more a day) and it's so hard to keep up with her. I am back to work now for 3 weeks. It sucks, lol. I miss spending so much time with her. My company doesn't have a maternity policy, so I had to use FMLA/Short term disability and only got 10 weeks. I have a great sitter though, so that makes it easier.
Pumping for me got easier once I started back to work. I had a really hard time with it while I was home with her since she would fuss as soon as she saw me pumping. Plus, since I was still primarily BF, I never would get much. Now I pump first thing in the morning and have enough to give her 5 oz to start the day, and 5 oz to save or send to the sitter. Then I usually get 10-12 oz from 2 or 3 pumping sessions at work. Some days are better than others, which is why I supplement with formula. I also try to pump before bed. It's so hard to do sometimes, and can be very stressful. Some days I feel bad for having to supplement formula, but then I remind myself that I'm doing what I can and it's better than letting her go hungry.