You may have a yeast infection. Pain, swelling, a bad odor, and a white discharge, are all signs of this problem. Yeast infections can be caused by several factors, such as a weak immune system, antibiotics, or wearing tight clothes. To treat this, you can do it through over-the-counter antifungal cream or pills. As for hygiene, maintaining the dryness of the area and adding cotton underwear can also assist in that.

Stress, alterations in routine, or hormonal imbalances can affect your cycle. At times, periods can be delayed for a few days. In the case of still not having a period for a week, then take a pregnancy test to make sure that it is not a pregnancy. However, the most important is to take care of yourself and be calm. 

It could be a yeast infection. In cases of the yeast infection, the white patches, anal burning, and thick discharge would be among the main symptoms. They happen when there's too much yeast in the vagina. If the common problem is treated with over-the-counter antifungal creams and pills, it will possibly be resolved. Make sure that you wear only cotton underwear and that you stay away from scented products. Drink plenty of water and stay away from sweet foods to heal it.

The painful menstruation is common for many women. One should get some rest, warm up and use a heating pad to reduce the pain. However, if the pain is extreme or bleeding is severe, you are advised to see a gynecologist for accurate diagnosis and treatment.