1. Combination birth control pills (not progestin only pills) are the best method we have to relieve painful periods. 90% of women who take the pill find relief from menstrual pain.
At age 47, it's not unusual to miss a period or two and to have periods become more irregular. The pill will also resolve that irregularity.
Pre menstrual syndrome or tension (PMT) is not well understood, but we do know that it increases when there is mores stress. It is often relieved by increased exercise, and decreased sugar and caffeine.
There are certain birth control pills that have been shown to decrease PMT for many women.
2. The feeling of pressure in your rectal area should be evaluated by your doctor. It could be related to a rectal polyp or other tumor, or could possibly be due to irritable bowel syndrome, which would go along with the loose stools. Diverticulitis may also be a possible cause.
3. Your sore throat and coughing up orange phlegm are likely due to an upper respiratory infection, possibly with some sinus infection. It can be treated by drinking lots of fluids, getting extra rest, and cough drops. If it doesn't resolve, then see your doctor.
4. When you see your doctor, I would have the urine ketones re-checked and evaluated. If it's an isolated finding, it's not likely to mean much. Best wishes.