Hi, my pulse is very weak. i've been suffering lately from orthostatic tachycardia and faintness and had heart tests done but the very weak pulse is new with more frequent chest and jaw discomfort.

Too compicated: This is not an issue to be addressed on the internet. You need a good cardiologist or an internist with good cardiovascular knowledge to see and manage you aggressively. Could not even begin to answer your question (if i knew what it was) without full records, exam and testing.

Chest pain : Did you have a stress test done as part of tests? Did you have blood tests to rule out heart attack? You should go to er if these symptoms are happening again because you could have a serious heart disease going on.

The root cause: The best thing to do is to find the root cause before any procedure. You might benefit from a session of multifunction cardiogram to seek the diagnosis first! http://en.M.Wikipedia.Org/wiki/multifunction_cardiogram.