I posted this on someone else's thread earlier with a tricky toddler, my two pennies worth was that there are parent classes run at Sure Start centres you could go on. Your HV will be able to tell you about them. This may give you ideas. Some of my friends have been on them and found them really helpful.
I tend to tell my LO when she throws an almighty tantrum "that won't work my friend" and walk away. As long as she is safe, I just walk away and say that I am leaving the room and that she can come and find me when feeling better. As even if they do not talk much yet, they often understand; use words you know that they know. The truth is I try to keep an eye on her when I leave but make sure she's not aware (peek through hinge) I often find that once she realises I'm not taking any notice she gets up and stops shouting.
Afterwards I try to resolve it by saying "now that was silly making all that fuss come and say sorry and have a cuddle".
I find if I react to the tantrums, she does it more often. Almost attention seeking, who knows?
Obviously if out and about you cannot do that. I try distraction and if that doesn't work, I tend to abandon the trip and get home. Then when we got home I'd say you cannot play with "favourite toy" when we get home as you've misbehaved.
Has something triggered this behaviour, apart from the old "terrible two's" as they call it . Something changed recently?
I think this is a controversial area and lots of people will have different ideas. I think as long as you and your partner/ husband agree and are consistent sooner or later it'll pass.
If you're already doing lots of praising as well and keep doing that. You're approaching things the right way. My daughter is 2 and a half and it's a tricky time when they're this age, sending you a virtual hug. Hope someone else has some advice for you x