I suggest you try a different chelation method before you give up. Not every method works well for everybody.
You have been chelating for 3 of those 6 months? That's not very long. I think I said before that it took me 6 months of regular chelation before I felt better. That was with cilantro and chlorella.
How do you feel when you're chelating? Do you feel worse? That's typical. If you don't feel anything different, then that could be a sign that metals are not being moved.