Pepe,
If you think candida/and or parasites is a problem worth looking into then i really suggest you check out www.candidaforum.com.
These people have helped me when i was too sick!I have made a long journey back from candida/parasites/adrenal weakness,liver etc etc..
I have learned soo much info.
I also suggest going thru archives a bit as there is valuable info there too.
btw...cultured foods and probiotics(good quality) can make a big difference in healing your immune system.Try and get probiotics which are proven to survive stomach acid,as i think most are garbage out there.Some i know of are Culturelle,primal defense,sbx,nature biotics,and optiflora.