Hi.. maybe it's whatever you ate(not just today, perhaps yesterday, or sometime recently. i kept a daily log of my eating, that's how I determined what foods I can and can't eat. it is difficult, and you can't compare your eating with someone else eating. Example: My friend has Crohn's disease she can;t eat cranberries, pomengranite, wheat and a few other things. I can't eat popcorn, nuts, spicey food or red meat(and still learning what my body rejects) As far as yoyr aching joints try light excercise, i do squats for my knees and arm circles for my shoulders. i am currently taking pentase 500 mg 8 oills a day, maybe ask your Dr if you can try this medication if these suggesstions don't work for you. Hope you feel better!!