Hi both have the same chemical ingredient called bupropion. Bupron SR is slow release whereas bupron XL is extended release.
Usually XL preparations give less side effects than SR preparation.
Continue treatment and contact your Psychiatrist.
Antidepressants can temporarily increase anxiety. In two weeks or so this will subside.
Next Steps
continue treatment and contact your Psychiatrist
Health Tips
try regular exercise meditation and relaxation. if you smoke, stop smoking. same with alcohol