Welcome, Elle,
And Congratulations on your weight loss surgery.
It's only natural for most of your so-called normal patterns to be off the wall. After all, you've just had major surgery and your body is trying to heal itself.
This is critical: Are you getting your protein in? Your fluids?
About the itching . . . can you walk indoors without the itch? Although you should be sure to pass along this information to your medicos, could be you just need to limit your walking to indoors for a while.
As to sleeping:
Try to keep your bedroom cool enough that you feel the need for covers of some sort or other; while it's good for your body to be warm, you will sleep better if you're breathing cool air.
Does your clock put out enough light to read it in the dark? If so, turn it to the wall. You want your room to be dark. You may need to close your drapes to keep out ambient light from the street.
Do you have electronics, like a computer, in your bedroom? Make sure they're turned off before you go to bed. Cell phone? Put it to bed when you go to bed; or put it in another room. As to that, stop all bright lights, computer, tv, etc., at least 30 minutes before bedtime.
Have a cup of some soothing tea at least 30 minutes before bedtime; you might try a generic chamomile, or Sleepy Time from Celestial Seasonings (or similar). GABA is also helpful for some people; an integral part of the central nervous system, it quiets the mind, allowing for easier sleep. Check with your doctor or nutritionist first, of course.
Here is some information from the November/December 2012 issue of Natural Health Magazine.
"The air you breathe colors your dreams, according to a German study; pleasant (or foul) smells can influence your state of mind whether you're awake or sleeping soundly.
"So, nix the nightmares by moving your wastebasket and hamper away from the bed, and sweeten your slumber by keeping potpourri, a soothing oil such as lavender, or a few fresh flowers on your nightstand. Both your nose and your subconscious will thank you!" [Note: this does Not mean air fresheners, which are usually filled with chemicals you neither want nor need.)
There are also many deep breathing and visualization exercises which can help. Take a look around the Internet to see what you can find.
Again, Congratulations!
Tom