3 year old getting tonsils removed.. Any advice?

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My Daughter  turned 3 jan 3rd and will be getting her tonsils and adenoids removed February 9th. They will put her to sleep with the sleeping gas and then do her IV After she is asleep.. Then we will stay for 24 hours after before being released. I was told by the doctor to expect a 2 week painful recovery.  She has also never had to be put to sleep for anything before..I'm also worried she will wake up before they come and get me and she will freak out if she wakes up and does not see me or anyone she knows.. I'm a nervous wreck and hate seeing my baby in pain.. I'm also 25 weeks pregnant so idk if that's making my nerves worse. But I am very nervous over this. Any advice from Moms that have been through this with their little ones?