I still have a constant ringing and deafness in my ear . i need to visit an ent. do i have to revisit a gp again ? or can i go directly to the ent

Depends on rules: One can go to see an ENT doctor without a referral unless one has a restrictive insurance plan such as an HMO or a POS plan that requires a referral. If one has a PPO plan, a referral is almost never needed unless one has a rare, restrictive PPO plan that requires a referral. For better insurance coverage, one should see an ENT doctor inside his insurance plan network.