I have done 23 liver flushes. The flushes are not painful. Some of the potions taste bad, and there may be some nausea after taking the oil, but there is no pain.
Here are some hints to make you flush easier and trouble free-
Do the Hulda Clark flush, its easy and effective.
Follow the rule not to eat after 2 pm to the letter. Solid food in the stomach when the oil hits it is an invitation for nausea and vomiting. You can drink some liquidds after 2, but do not take any after your second Epsom Salt drink.
Mix you Epsom Salt in apple juice, it tastes much better. Have a wedge of lemon or lime to suck on after drinking the ES, it takes the bitter taste away
Keep some small pieces of peppermint candy nearby to help with nausea and dry mouth during the night.
To make the flush even easier, drink lots of apple juice and eat raw apples for three to seven days before a flush. Later, you may want to try an apple juice fast prior to flushing. This is not necessary, but may help later on.
Eat low fat foods for several days prior to flushing.
I can get Epsom Salts at any Walmart, drug store and most grocery stores. I also live in a very rural area. You should not need a prescription for it. IF you are not in the states, you may have to ask your druggist for it though.
Good Luck and Happy Flushing