Severe chest tightness and preassure, with breathing problems that never goes away, gets worse in the evenings. stomach pain and blurry vision aswell?

Needs examination: There are multiple symptoms you are describing that may be linked to the same cause however it is difficult to comment without an examination. You need a proper medical consultation with your doctor who can examine you and order necessary blood tests and imaging to reach a diagnosis

See your doctor: You have a systemic illness. This needs to be looked at by your family doctor. The blurred vision may just be due to a refractive error that needs correction by glasses or it may be a sign of an abnormal blood sugar from diabetes. Don't procrastinate. See your doctor.