Definately, appeal. When you applied did you submit medical evidence with your application? Also non-medical evidence is important, like your absentee rate. Letters from doctors? If not, you might want to submit them with your appeal. The first appeal is called reconsideration Unfortunately, 89% of claims are denied at his level.
I would consider filing your first appeal without a lawyer then if you get denied hire a lawyer. You can call Social Security get your records and the reason you were denied (typically you can do current, past or other work). Then correct the application's faults.
Also, the Adult Function Report is an important supplemental document to submit with your appeal if you didn't submit it with your application. Write as much detail as you can. Everything is important when filing your claim.
There is a copy of the Adult Functioin Report on my ** Also, your doctor should fill out the Physical Residual Function Report, also available on the website.
Good luck. Keep us informed as to what happens.