I too promise that this will pass. What worked with my daughter was putting her in her room when she started to tantrum. There was no set time limit, she could rejoin us as soon as she stopped tantrumming. It took a while but the tantrums did eventually mellow a bit and now she is 4 she almost never has them. This seemed to work on three levels. 1 - she learnt that tantrums got her no attention. 2 - I was less likely to lose my temper when she was out the room and 3 - this gave her time to herself to regain her composure. I have tried a naughty spot in the past but tbh she would just scream louder. Going to her room worked well as it is her space where she has all her comforts and toys so she feels less monitored and is able to calm herself. Once she gets past the tantrum then of course she gets lots of cuddles, etc, but nothing whilst she is having a screaming fit.