Usually most people find doing cleanses helpful but many of us have found that just doing cleanses was not enough. Read about the various cleanses on the Liver Flush Support Forum . Most of them include a parasite killing program.
Could you describe the 'egg sacs' you have seen? Most parasite ova are too small to see without a microscope.
Some causes of tireness
low vit B12
lingering viral infections
and many more causes.