How can I make my hemorrhoids disappear?

Surgery. Short of surgery nothing else will make them disappear. They are normal veins. You may be able to reduce their size and degree of inflammation with diet, fluids and prescription topical agents. But surgery is the only way to make them "disappear".
Soak. Sitz baths (soaking in warm water) and ice can both help shrink hemorrhoids temporarily. Avoid pushing or straining when you have a bowel movement. Increase fiber and fluid intake. Don't use a donut pillow - this can actually aggravate hemorrhoids. Wipe gently and avoid irritating the hemorrhoids. Wipes can be irritating. An oily cleanser like balneol can be helpful. See doctor if no improvement.