Cervical medial branch block with DEXA lidocaine gave me 1 day of neck pain relief. After 1day neck pain again. Ok to Proceed to radiofreq ablation?

No way! Be patient. Some times it takes a few weeks for DEXA to get effect. Ablation is a serious procedure with some side effects and no warranties. Rec. see your pain management specialist for medication adjustment (e.g. tramadol, relafen, (nabumetone) Lidocaine 20% patch, etc.) Also cognitive behavior therapy. East-West integration medicine. Take care.
Not yet. The Lidocaine would be expected to wear off in less than a day. The Dexamethasone takes 1-2 weeks to show maximum improvement.