Call your Dr. immediately- as these are concerns for post surgery. I know there are some symptoms that are normal post -op but can't remember if those are some of those? The dizziness can come with dehydration and this is a possible post op problem. Are you a diabetic- anxious and sweaty are symptoms of low blood sugar.
Dont worry about hitting the plateaus the scale will reward you with a lower number soon enough.
We got a new digital scale and it says weight can be off up to 3 pound due to holding fluid, hormones and time of day. It's very important to weight yourself same time every day. As long as you are following post of instructions, I would'nt worry about it. I weigh myself right before or after shower after urinating and before eating or drinking anything.