Welcome to icliniq.com.
I see you have messed up your hormonal balance. Your first step was absolutely right. The principle of emergency contraception is that it is a very high dose of progesterone hormone. This is the same hormone produced in the second half of periods after ovulation. This makes the inner lining of the uterus (endometrium) very thick suddenly, by a single dose. This thickness is unfavorable for the possible pregnancy. So, the embryo that is formed just slips out without a proper place to sit. As it is a single dose, it cannot hold on, and it gives way or falls off, so you will have periods within 7 to 10 days of having pills. This is the same hormone in combination with estrogen in Yaz (Ethinyl estradiol and Progestin).
If you recollect, in the second half of periods, you have similar symptoms of nausea, vomiting, heavy headedness, bloated feeling, mood swings, depression, and breasts discomfort. As the hormone has been taken in a high dose, that too on two occasions, the symptoms are exaggerated. You have to wait for 7 to 10 days after the intake of emergency pills for the bleeding to occur. You can try taking symptomatic treatment for gastritis, like Pantoprazole and Domperidone combination, twice a day, half an hour before food. Consult your specialist doctor, discuss with him or her and start taking medicine after their consent. If you have crossed your expected period date by even a day, you can check your urine for pregnancy. Further confirmatory is blood serum beta-hCG (human chorionic gonadotropin).
Emergency pills are effective if taken within 72 hours, and maximum effectiveness is within 24 hours. When there is a delay of emergency contraception, the best method is to have IUD (intrauterine device), which is effective till five days after sex (only possible if you have had any vaginal delivery till date). I would like to clarify that the safest method is taking hormonal pills. Any of the birth control pills is a combination of estrogen and progesterone, and these are the same hormones produced in your ovary every day. So, how can they be harmful? By taking these pills, you are creating an artificial hormonal atmosphere, where continuous level suppresses the ovulation and results in no pregnancy.Oral contraceptive pills will give 100 % protection and can avoid all these anxious moments. They are to be avoided or used with supervision in ladies with obesity, smokers, liver problems, coagulation problems, and allergy. But I find it absolutely safe for you.