Help please anyone

Hi I have been looking round this wonderful site for 2 days now and have just joined I am sorry to make this my first post but I really need some advise.

My Son Thomas is 3 and for about a year now we have noticed something wrong with his Speach so we have got him under S.A.L.T and had his ears tested his hearing is fine.

 But just of late the last few months he seems to have gone backwards which his S.A.L.T agreed with me on yesterday. To tell you some of the stuff that's going on he likes to smeer his poo all over my walls and the floor I have found him a few times now and he has face painted his whole body in poo. Now I am pretty sure that it should make him feel sick but he thinks it's a great game. He is just as bad with his wee he wont wear a nappy and he wees everywhere.

I took him to my friends the other day and he weeded all over her hall wall. He Dose not know how to play with other children it's like he trys but he dose not understand how to join in and then he gets agressive and hits and kicks he has been know to throw toys and chairs at other children to.

 He freaks if things are not done at a certain time everything has to been the same everyday.

 He gets aggressive with me and his little sister for no reason. And it's like he goes onto hyper drive running about jumping on things its like he is sped up.

 When people touch him he says aww he hates wearing clothes and gets quite upset like they are hurting and he has to get them off. He also flaps his arms and shakes when things become to much. I hate taking him out as he has no fear he will run into the road and passing cars.

I have a family member who is A S.A.L.T and she came up to me and a family get together and said she is very worried about him and she feels something is not right. Then I have heard a friend and a friend who looks after kids with asd has said that she is worried something is not right. The S.A.L.T I saw yesterday said this was out of her area. I am so worried and confused I dont have a clue what is going on I don't know how best to look after my son I am so so tierd as he is such hard work and I am trying to look after him and his sister and I have to be up everyday at 5am for work. And everyone seems to be asking me things and noone is telling my anything and I so need to know what's going on. I have an app with another DR the day before x mass eve but that's so long away