3 y/o screaming NON STOP

I. Need. Help.
I am at a total loss.
My daughter turned 3 in November. Since about August of this year she has been screaming non stop when with me. I mean screaming. All of her needs are being met. She is fed, bathed, clothed, loved, read to, she is in good health, goes to the doctor, to the dentest, everything checkes out fine. She pretty much only does this with me. She makes this sound like a crow at the top of her lunghs whenever we are in public and I tell/ask her to do something, If we are at the store and I try to stop her from riping open a bag of m n ms, or grab her hand so she doesn't run into the road she will scream 'stop! you are hurting me! Ouchie, ouchie!'. At home it is the constant screaming for a cup of milk, NOTHING BUT MILK, I mean a gallon a day wouldn't please her. I have tried it. 'I WANT MILKY I WANT MILKYYYY' all day every day. I live in an apartment now, and I am scared someone is going to think i'm hurting her because of the excessive screaming. Has any one else gone through this? I am going crazy. I have 2 other children, and I am begining to feel like I can't stand Piper, she is making my life so unbelievably hard. And I have asked family for help, but they won't watch her. They joke like we will watch any of them but Piper, not because we don't love her, but because she has become so hard to take care of. Has any one else gone through this just out of the blue? I have an appointment set up for her with a doctor on January 10th, but until then I'm at a loss. Her older sister (4) has ADHD, and this is nothing like that, and I'm just so confused. I'm about to go crazy with this... I've been trying to get her into child care to give myself a break since October, but it looks like that isn't going to happen until January either...

Err, sounds like she might be spoiled  
And IDK what to tell you to do about that other than set boundaries, stand your ground and punish her when she is being defiant like that.

Welcome to three they are angry at the world and testing every and all boundries my son started this upa few months ago and he turned 3 last August that and whining about everything and anything

Are you giving in to her when she screams?

Sounds like my 3 year old. I've tried everything, nothing works. I'm beginning to think he might have ODD.

Quoting {tamz}:" Are you giving in to her when she screams? "

No!

I've been through the 3's before, and they were never like this! I know kids are different. She is the middle child, and my family says thats the problem, but I don't get it! And if this is the 3's, am I just sopossed to stay away from public places until she grows out of it? I try to go to target, and am embaressed and almost in tears by the end because of how sher is acting, yet the other two do fine. She is also a runner. She has no fear of roads, will run up to strangers and hug them, run out of stores at the mall. I am one of those parents who has a harness on there kid because I'm so scared she will get hurt/taken. (I don't use it like a leash, I put the strap around the handle of the stroler where she is sopossed to be holding on, so if she tries to runn of she can't)

Quoting LP&Bs MOMe:" I've been through the 3's before, and they were never like this! I know kids are different. She is the ... [snip!] ... I put the strap around the handle of the stroler where she is sopossed to be holding on, so if she tries to runn of she can't)"

My son mainly does it at home in what his doctor calls his comfort zone in public he is very well behaved and people always comment on how great he is but he did act up once I told him if he didn't stop there was a bench in the front of the store and he would sit on it for two minutes that was the first and last time he sat on the naughty bench in the store. He really hated it.

All kids are different. Unfortunately, my 3 year old was like this.   It's really irritating, just try to stress patience and it WILL end!