My 12 month old is turning into a monster!

Help! My totally calm totally well behaved up until this week 12 month old has all of a sudden turned into a monster. This kid would sit for hours and quietly play with her toys, take 3 hour naps once a day, eat all the food she was given at meals with no complaints etc. But about 3 days ago she’s started throwing temper tantrums, full on screaming and flailing all over the place. She throws them when not given what she wants or not getting her way, she won’t eat what I try to feed her and just screams and throws it everywhere, and she screams when I try to put her down for a few mins so I can get stuff done.

I’m so exhausted as this is totally new behaviour for her so I’m not used to it at all. Is this normal toddler behaviour?