Are 7 month old babies known for being very difficult?

My baby is nearly 8 months and ever since she turned 7 months I am really struggling to cope with her. Her sleep is all over the place, she is extremely clingy and cranky and when I try to nurse her she just flings herself around and won’t concentrate. I don’t want to get into a big rant about her but that’s the gist of it. Is this normal? I’m really having a hard time and everything was good before I still managed to keep on top of housework and shower every day but for the last few weeks everything is just a mess and I feel awful about myself and feel like a terrible mother ☹️