I'm gonna lose it!

I feel so terrible for feeling the way I do.... but my 17 month old is HORRIBLE. AALLLLLLL she does is scream, and cry and whine NON-STOP all day long. She was starting to get into her "terrible twos" stage and then when I went back to work all hell broke loose. Instead of being an occasional thing, her fits and tantrums are all day every day. I litteraly am so on edge every day because I am so sick of hearing her tantrums and being slapped in the face and having food tossed all over the carpet. What happened to my sweet wonderful smart little girl? Every time I drop her off with the day time sitter she goes postal.... she follows me around begging for me to pick her up, and then when I do, she throughs and kicks until I put her down. I literally cannot even take her in public anymore. The last 10 times or so have been total nightmares. I don't even get embarrassed any more. I just get exhausted from chasing her and having to make sure she isn't hurting herself or destroying property.

Is this just typical toddler behavior? It's pretty much a daily thing now where I get so frustrated I cry. I even yelled at her today.   I never yell.

My daughters the same just not that bad but bad she'll be 2 in January the pediatrician said it was normal.