dawng
Welcome to the forum, you might want to have a look at the following FAQ which explains where everything is
Welcome to Benefits and Work ESA is an indefinite award with regular reassessment if you contact the DWP office dealing with your claim then they should be able to tell you when your claim is likely to be looked at again. You might also want to request a copy of your assessment report so you can understand how you qualified, it's ESA85 if you had a face to face assessment and am ESA85A if you dud not.
Gordon