18MO DDs behavior has become terrible!

[MaisieMooMoo]

My DD is normally a lovely, quiet but sometimes mischievous little girl but over the past few days it's all went down the drain!
It started the other night when DP told her off for going up to the TV, she started screaming extremely loud and out of worry of her headbutting the unit I went to take her away from it only for her to fling her head right back and bust my nose!
Then today was an absolute nightmare, DP was playing with her and she bit his finger and refused to let go, we had to force her mouth open to get her to stop! Which then resulted in her screaming for 10 minutes straight. Also, when she was in the bath tonight (which she normally loves) She just totally freaked out, screamed the whole time and was jumping up and down and throwing all her toys out of the bath.
I just don't know what to do, she's never normally like this. Normally you have to tell her no a maximum of three times and she listens and is normally a complete delight to be around.
Is it possible that it's maybe just the terrible twos hitting early? Some help would be greatly appreciated as the screaming is so bad I sometimes worry that my neighbors are thinking we're hurting her!

What's her speech like op? Could be she's lashing out through frustration, that was certainly the case for my ds2 at the same age.
Or could she be poorly? I know I don't like people manhandling me when I feel rough.
I know it's tricky (been there!) but ignoring the bad stuff unless it's massively dangerous and heaping huge ott praise for the good stuff (anything good - make it up! - ask her to do spurious unnecessary things just so you can say 'thanks!').
And repeat and repeat - it's just a phase....

She's getting there with her speech, can say a few words rather clear. She's normally quite good at letting you know what she wants eg. she goes to her high chair if shes hungry and gets her teddy that she takes to bed with her if she wants a nap. She seems to have calmed down a lot now, just the occasional outburst. I was wondering whether to give her some calpol incase her teeth are bothering her as I can't think of anything else that would be wrong (no temperature etc).
Have been heaping on the praise big time and it does seem to be working so thanks for that little bit of advice!
Have also contacted HV to see if there's anything else we can do to make life a little easier for all three of us as her sleeping at night seems to be a little wonky as well. She normally sleeps through all the time (has done since she was 3 days old).