This is my Bear's behavior from maybe around 3 months? The pediatrician says that he on the extreme end of normal and might grow out of it by 3. Well that's 6 months away and I'm not holding my breath.
How do we deal with it? LOTS of patience. Also lots of preparation. I try to avoid taking him places that I know will set him off unless I have to. When we do it is always with a lot of forewarning. Transitions also get a lot of forewarning. I carefully went through the Overexcitabilities and made a list of everything that fits Bear. We've also sent him to our chiropractor and (surprisingly enough) that has helped with the tantrums.
However if this is a new development I would try to figure out when it started and if there was any sort of trigger to it.