What are my options regarding my DUI charge wherein I blew a 0.00 BAC but failed field sobriety tests?

Hello, I was charged with a federal DUI because I drove onto a marine base. I failed all field sobriety tests, however, I blew a 0.00% BAC, I didn't refuse any other toxicology tests because I wasn't requested to provide any urine or blood samples. Military police officers found blue pills in my car which I identified as my prescription Xanax and Zoloft. I have these prescriptions in my name. The police report didn't mention that the officers took samples. The only thing the officers took into evidence was a legal substance called kratom. I can provide the entire report. I have court in December. I was advised to plead guilty but I need another opinion. Thank you.