Who is best to speak to regarding my child behaviour

Oh mama it's tough. In what way is his behaviour challenging because this sounds like my 19mo too. They're just curious at this age and yes, you do need to be thier shadows constantly

he doesn’t sit and play with his toys he throws them at me or our dog even out shopping he has to take cars with him they come everywhere and he will try throw them at people walking past. He tries to pick up vases and candles anything within reach he will grab and throw. He’s pulled curtain poles off the wall he’s broke his highchair from throwing himself back. I do as much as I can with him we go swimming we go to the soft play and park but even then he still continues with the behaviour 9 times out of 10 he gets put in his cot in his room and left alone to calm down which doesn’t work but gives me an hour to myself 🤷🏽‍♀️

Honestly it sounds completely normal. They don't have the ability to understand much yet in terms of why they can't do something or why it may be dangerous. They need so much input from us. I don't get a minute with mine, he needs constant supervision..I eat when he does and do other things like chores while he "helps" - it takes forever but it's the only way to get anything done. The only thing to do with bad behavior is not to give it much negative attention, put things out of reach if they're dangerous and give lots of praise and encouragement for behaving nicely, showing them what you want to see

I think if you're concerned speak to the health visitor but my bub is very similar. He throws everything, he even broke our TV by throwing a toy car at it. He also feels the need to take about 10million teddies with him when we need to leave the house, and has now started running away every time we put him down lol. I think its just curiosity and so not worried at all, hes just learning. I'm lucky that my husband is hands on and my bub goes to nursery so I do get a break but on days I'm alone it is very exhausting.

I definitely feel your frustration and exhaustion, but it sounds like normal behaviour. With our little one we take her toy off of her if she throws it three times after we ask her not to, it does lead to a bit of screaming but it’s usually possible to distract her with a song or by pointing out things or talking to her. We also try to give her plenty of space where she is allowed to throw things by taking balls to the park and finding space where she can practice throwing safely. For quiet time giving her crayons works for me (that’s what she’s doing as I’m writing this although I have had to stop 3-4 times to help her) or otherwise sometimes we give her a bit of screen time 10-15 minutes of nursery rhymes will usually keep her occupied and I can sit, but that’s the only sitting I’ll get done in a day. She’ll only sit and play with toys if I play with her.

Sorry you're having such a difficult time. An option would be to redirect his interest of throwing I a controlled manner you. Although I have only seen it in reels on Instagram where parents put scotch tape over the door and got plastic soft play balls.
Best of luck

Sounds like my girl! She's non-stop, currently in a throwing and hitting phase. I find the days she's better is when we've just spent time outside and she's been able to just be her wild self in an open space!
Redirecting helps a little, she was trying to hit me earlier and I got her banging the coffee table instead, when outside I get her to throw sticks/stones/pine cones into the long grass/verges. Rather than try and stop him, get creative with how to satisfy what he wants to do and he'll learn the boundaries.
I know it's hard and it's alot but leaving him in the cot isn't teaching him anything other than rejection which will have longer lasting consequences. Maybe you need some support? HV? Family? Put him in daycare?

How do you react when he is being like this? At 19 months they don’t have the understanding of what naughty is, and they can’t discern between positive and negative reactions, which means that if you have a big reaction when this behaviour happens (such as getting angry, shouting, sighing) he will likely be pleased he got a reaction out of you, and do it again.

Rather than telling him “no, stop it, don’t do that” at this age it is more effective to redirect him to do something less destructive. For example, my son went through a phase of hitting me in the face when he was sat on my lap. Instead of telling him to stop, I said in a neutral tone “ohh can you stroke mummy instead? Why don’t we try stroking?” And then I used his hand to stroke my face. After that, he stopped hitting most of the time, if he did it again I would repeat the same thing. Now he likes to stroke my face randomly, and doesn’t hit at all.

Good luck, hope this helps!