The first time I took praziquantel and albendazole together I also felt very ill but the third time I took it,is had no problems. Your symptoms are most probably due to die off from the parasites than the actual Meds. Don't give up,you will eventually come right.I now take my Meds 3 days before and after full and new moon. I must add here that I had surgery 3 x to remove cysts from my throat,oesophagus and epiglottis. I am due to go in again in two weeks time to have a cyst from the back of my tongue removed. I am going to have a 2nd ct scan to see if I have any new cysts. For all I know I could have cystercycosis and Dr's here don't know zilch. Hopefully all these Meds have helped by keeping them sterile.