Can diastasis recti cause my severe pelvic floor/ abdominal muscle spasms? seriously considering plastic surgery

Possible: Diastasis recti is the separation of the rectus abdominal muscles. While this in and of itself should not cause "severe pain" it may cause discomfort. If you are having severe pelvic floor and abdominal spasms, there could be other reasons for this. Before resorting to surgery, you might consider pelvic floor therapy, which can be extremely helpful for pelvic floor spasms.

NO: This is a congenital abnormality not related to puborectalis spasm. See neurologist for the latter. You'll be wasting time and money on plastic surgery