Every so often a couple of times a month im throwing up yellow bile what is this im not pregnant as im also having heavy and irregular periods?

Not normal.: Vomiting so often with yellow bile is not normal. It could range from not eating enough or often enough, to an ulcer. Combined with irregular periods, it can represent a thyroid problem. You really need it evaluated to know.

GI? GYN?: Check the timing of the symptoms with your menstrual cycle. Mid cycle could be from ovulation, premenses could be endometriosis. See your doc. May need gyn and/or GI evaluation. Also do a diet diary to see if there is any correlation (include meds, alcohol intake).