The flushes are really a piece of cake. Nothing to get worried about. Other than causing your body to react a little more than normal you aren't doing much more different than had you had a lot of fatty food in a dinner meal. The Epsom Salts are basically there to assist with relaxing and hence assists the dilating of your internals as needed. Then by nature helps to expel what comes through. There is an element of risk as with anything but it would be no more than with having a fatty or a high protein meal. The worse thing you'll probably find is the toilet visits, which is not much to put up with compared to the alternatives at present.
For more reassurance the protocol is based upon trying to make it safer by building up your bile and relaxing your guts.
cheers..
PS For me its the starving I don't like :-)