Could having cronic hep c and CHF on top of taking meds everyday cause toxins (meth) to take longer to process and leave the body then it would a norma?

Yes. Both of these illnesses interfere with the overall ability of the liver to do its job. You do know that hepatitis C is usually curable today if you can get into a functioning health care system -- consider a foreign country. CHF is often reversible if a cause is found -- it may be your meth. It sounds like you DO want to live. For the sake of those who love you, stop the meth. Best wishes.