I am sorry for your situation.
If the levels of liver
enzymes are not increased, then, you should be in peace regarding hepatitis C
Most probably, the methadone
you are using is the culprit of the headache and feeling weak and loss of appetite.
With regards to your high WBC
, as you are saying to have an infected tooth, most probably that is the cause.
Drink plenty of water, have your tooth well-treated, try to be physically active to overcome all your problems.
All the best