every time I take a shower my skin would get red itches

Hello, Sue.  How warm is the water in your shower?  If you shower in the hottest water you can tolerate, it could be that your skin is reacting negatively against it.  It would behoove you to try your water at a "cooler" temperature and see if that makes any difference.  If you don't think it is the water, have you considered the soap you are using? Maybe try a shower soap that is made for sensitive skin.  Apply baby oil without perfume on your skin after the shower to help keep your skin moisturized afterwards.  Hopefully, one or all of these interventions will help you.