The general solutions for the harmonic oscillator differential equation fall into four general categories: 1) Undamped: [math]x(t) = Ae^{i\omega t}[/math] This is a free-running sinusoidal oscillation that doesn't change over time.
Key Facts. 1  Itâs normal to have mild cramps during your period. 2  Menstrual cramps often start 1-2 days after your period begins. 3  If your cramps donât get better with over-the-counter medicine, you should see your health care provider.
Best Answer: Menstrual cramps to me feel like muscle contractions with sharp spasms in my lower abdomen. To sum it up in a few words, it feels like all my insides wants to rip out of my body. Period cramps may radiate to the back or down the thighs, and range from mildly achy to wrenchingly painful. In the severely afflicted, cramping may be accompanied by nausea, vomiting, headache, nervousness, fatigue, diarrhea, fainting, bloating, breast tenderness, mood swings, backache, and/or dizziness.