Help, 11 month old having tantrums already!

Hi,

 Need a bit of advice. My baby has always been a fairly calm and easy baby but more and more lately he seems to be losing his temper and having tantrums and its getting to the point where most things are difficult and end up in him screaming and having a tantrum.

When I feed him he spits his food out, when i change him he is trying to put his fingers in his nappy or crawl off, getting him dressed and undressed seems to end in him screaming. I tryto distract him but it doesnt work, im trying to keep calm and not shout but its difficult.

I didnt think tantrums and this sort of behaviour started this early! He is my first child so maybe i am overreactign a bit but its exhausting and the behaviour worries me

Any advice?