What do you feel trapped about? Drinking? Alcohol? You already know you have the physical and mental capacity to stop drinking. You've done it before, you can do it again. The hard, next step one has to take is to adopt a lifestyle that doesn't support continued alcohol use.
Don't wait on courage to seek more help. Don't wait on strength to quit. Don't wait on clarity to see a way out. Many people die waiting for the right time to quit. You don't have to worry about doing the right thing. Just don't do the next wrong thing. Come here first. Those feelings of fear, frustration and anger will pass. Best to let them pass here than trying to tackle it on your own.