As a person who has suffered from excema her whole life, I can understand how frustrating, embarassing, itchy or even painful having sensitive or sensitised skin can be. These are all learnt from my own experience, so I cannot guarantee that it will work for you. Everyone's skin behaves differently.
1. Moisturise! This is so important. Use an unscented body moisturiser in the shower/ bath and whenever your skin feels tight or dry. I use Redwin's Sorbelene cream everywhere except my face, and on my face I use Neutrogena's oil free moisturiser with SPF 15+
Use sorbelene as a body wash and shave gel if you think you need to.
2. Avoid soap. Soap, for me, is Hell. I cannot use a bar of soap at all, and I have to use moisturiser after using soft soap. Of course, I am NOT saying you should avoid washing your hands, but use gloves when washing the dishes and things like that.
3. Don't wash your hair regularly, and always wash the shampoo and conditioner out with your head tipped forward so the chemicals don't run down your neck and back.
4. Use 'sensitive' laundry soap. This has made a huge difference for me because my clothes are always up against my skin (obviously). Also, don't wear itchy clothing on your worst effected clothing. My hands are my worst suffered, so I have to avoid synthetic gloves.
5. Be careful of fragrances and other chemicals. Clinique is a good brand because it is 100% fragrance free. Sure, the things won't smell as pretty, but it does make a difference, and also gives you an idea what is in the product. Perfume is also bad so use it sparingly and don't apply to any irritations, even if it wasn't the cause in the first place.
6. Avoid salt water. I cannot swim in the ocean at all, and some salt water pools affect my skin. Think red, stinging and burning...
5. If you skin is particularly bad or persistant, I'd recomend talking to you GP about it. There are some creams on the market that are prescription only, but do work. It can be expensive, and isn't that brilliant for your skin, so this should be used only when it is ruining your life.
I hope these tips can help you keep your sensitive skin under control.
P.S thanks to everyone who has given me feedback about the new comments/ layout thing. I have finally gotten things working, and the support has been very appreciated.