I do not recommend Epsom salts at all for a hemorrhoid. The best remedy I have found is Witch Hazel. It cools the area, and definitely relieves the itching and burning, that go with hemorrhoids. The best part about witch hazel is you can use it as often as you need to throughout the day. It also helps to shrink the area, which is what is needed in order to begin healing.
Also, drinks lots of water (fluids), try not to stand too much, especially in one place too long - this irritates the hemorrhoid and causes it to swell more. Lots of fiber in your diet, helps too! Being constipated is a big reason why you get flare ups!
The over the counter medications do help a bit - I personally prefer one called Anusol - has more pain reliever than others. Stay off your feet if you can.
Good Luck! The witch hazel has been a blessing for me!