Urine test produced false negative for oxycodone and lorazepam have been on these meds 20 years doctor will not refill what do I do?

Tough spot. I can't say what your doctor is thinking, but I know that many doctors would think that someone is selling or giving away medications if a urine test is negative. Your doctor may consider a re-evaluation, a repeat urine test, or a blood test. However, urine tests tend to be given credence.
Are you taking them? If the urine test is negative, are you taking the medicines? If you are not taking the medicines, perhaps it is time to move on. If you are taking the medicines, perhaps it is time to have the test repeated.