Just that really. I have an 8 month old. She was quite an easy newborn but is now crawling, cruising on furniture, screams if she is left for 5 mintues,, and I am finding it very wearing. Her sleep has deteriorated too. What I really want to hear is that this is the hardest stage and it gets better 
I was speaking to a friend with an older DC about this, and she said 18 months was the low point and for her it got better after that. I would be interested to hear other people's experience.