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I can imagine how distressing and worrisome this situation must be for you. You very likely are exhibiting withdrawal symptoms from the Cymbalta. Nausea, headaches, mood changes, other sensations are common withdrawal symptoms. That your sensation in your stomach is a burning sensation is a bit worrisome, though. If you start feeling your breathing being shallow or you feel lightheaded, then please head to the ER right away or call 911. But even with just the burning feeling, which may be of a "common" side effect of sudden withdrawal, you should be under supervision during the withdrawal period.
Cymbalta is an SNRI and that is a class of medications that needs to be weaned off from gradually to avoid withdrawal side effects, so you need to call your doctor and discuss with him/her if you should wean yourself off from it gradually. If it is determined that the burning sensation is not a cause for concern, then you might decide with the doctor to continue cold turkey as you've been doing and just keep monitoring it.
You might also consider adding a behavioral component to your treatment for your anxiety and/or depression. While behavioral treatment requires more effort from the patient than medications and is not as quick acting, it doesn't have the side effects nor withdrawal symptoms of the medications. If you would like to introduce a behavioral treatment, feel free to ask me another question about it. Just write “For Dr. Mark” at the beginning and everyone will know it’s for me.
Okay, I wish you the very best!
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