Filling my little one's tummy

Let me just say, breastfeeding is by far the hardest thing I've done so far in reference to raising Lilian. It's inconvenient, in the beginning it's painful, it's stressful (is my baby getting enough milk from me?). Then of course are the comments when other people ask if your breastfeeding, like "Isn't she old to be breastfed?" How the hell is a 6 month old, too old to be breastfed? Whatever.
Even though breastfeeding my daughter has been hard for me (I know alot of women have it harder.), it's the most enjoyable thing we have between each other. When it's time to nurse, I feel like I can almost sigh out of relief, and just relax. I actually read that nursing releases endorphins in women....makes sense.
Well we started solids, and it's bitter sweet. I realize, even though she's only 6 months.....my little baby is growing up and won't need my milk as much, but I do like the more free time solids has brought me in between nursing. Sometimes, though, solids seems a little stressful We started with apples which I thought Lilian liked, but now, she has thrown up twice with apples. She has thrown up other foods also, so I thought I was filling her up too much, and cut down her portions. Nope....didn't work. I then thought of trying different textures, that didn't seem to make a difference. Now I don't want to make it sound like she throws up ALL the time, she has only thrown up probably four times, and we've started solids a month ago. So I guess just like breast feeding.....solids are going to be complicated and exhausting, but worth it in the end.