Will an ulcer caused by stress go away on it's own if the stress goes away?

Eliminating the cause of any condition will help but it may not be a total cure if the condition has been allowed to progress. You're helping yourself by eliminating the stress. Let a doctor help you finish the job.

I do believe that research over a decade ago showed ulcers were NOT caused by stress but bacteria .

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What are the causes of peptic ulcers?

For many years, excess acid was believed to be the major cause of ulcer disease. Accordingly, treatment emphasis was on neutralizing and inhibiting the secretion of stomach acid. While acid is still considered significant in ulcer formation, the leading cause of ulcer disease is currently believed to be infection of the stomach by a bacteria called "Helicobacter pyloridus" (H. pylori). Another major cause of ulcers is the chronic use of anti-inflammatory medications, commonly referred to as NSAIDs (nonsteroidal anti-inflammatory drugs), including aspirin. Cigarette smoking is also an important cause of ulcer formation and ulcer treatment failure.

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Pathology of ulceration

[edit]Causes
The most common causes (not in order) are:
Bacterial infection
Viral infection
Fungal infection
Cancer - both 'primary' and 'secondary'
Venous stasis
Arterial Insufficiency
Diabetes
Rheumatoid Arthritis
Amyloidosis
Loss of mobility
Hypertension
Gastroesophageal reflux disease

No, you have to see a doctor.

No, consult a doctor.

If it were me i would see my Doc & let him help.Good luck.