43yrold-progesterone 200mg(day1-15)-400mg(day15-28)and dhea 50mg-for pms symptoms x2yrs.what happens if i quit cold turkey?what will side effects be?

Why cold turkey?: Discuss with your GYN about changing your hormone regimen. You have an interesting combination since the progesterone is likely turning down (if not off) your natural estrogen/progesterone production while the DHEA is a precursor for hormone production. If it's doing anything for you, stopping cold turkey is going to leave you feeling fairly crummy.