I've done one round of synarol and I am about to start on it again for my second cycle of ivf. I did get quite a few side effects from it although they took a few days to really gain intensity. I had quite a lot of headaches and some hot flushes (particularly at night!) but the worst was probably the mood swings. I don't know how my DH puts up with me!
Then again, I feel like its been such a long time (almost 18 months) since my body was actually "normal" and not on some form of drugs/stimulation that I almost forget what it is like NOT to have side effects and constant mood swings!
Like others have suggested, do not dwell on the side effects. Think of them as a means to getting what you want! And I was always relieved to have some side effects (however horrible) because at least then I know that the dugs must be having some effect! (I become paranoid if I think things aren't working! )