Hi Frances,
To add to the previous answers here's my 2 cents. I have "suffered" from symptoms getting worse when doing SFQ. I've been trying to understand it in my own way....
Whenever I'm opening a channel and there is a blockage, the blockage may open totally or partially. When I stop the SFQ session the blockage may disappear altogether or return. When I'm very successful in opening a "big" blockage I may feel some unpleasantness. "Symptoms getting worse"
The blockages are there not for nothing. Usually they serve some purpose or other. The purpose may be ridiculous or totally obscure. (Usually my blockages try to protect me from something, but they don't success very well and cause other "problems".) When the blockage is openened, the original problem, which the blockage tried to prevent, may occur. The paradox is that the "cure" may make it necessary for the "problem" to exist! When your mind realizes this, it does not need the original problem anymore, and the blockage can disappear also.
When "symptoms get worse" it is your mind that tries to follow the old routine. It takes some time before the mind realizes the new way, but sometimes it can be really fast.
-purjo 
