Please help

My daughter is currently 7 months old. I am feeding her 3 tablespoons of cereal in the morning and fruit or vegetable at dinner. I started feeding her at 6 months and she’s almost 8 months now. Last night every time I would put her in her crib she would wake up and cry and as soon as I picked her up and brought her to our bed she would go to sleep. This happens on and off one week she won’t wake up then the next she won’t sleep but she’s pooping regularly. I am breastfeeding exclusively except for when I feed her food. Is this something I should take her to the doctor for? I’m so exhausted.