Non-Matching Symptoms - Help please!

Hello,
I have a large amount of odd symptoms and cannot figure out what the problem is. I don't have insurance at my job yet, so I really appreciate any help.

About 2 weeks ago, my ear filled with fluid and I felt dizzy and had severe muscle pains all over. I went to the walk-in clinic and was prescribed prednisone and singulair (I've never had a history of allergies or sinus issues). The fluid subsided and I finished the medication.
Not a week later, I have had to go to the bathroom almost immediately every time after eating, and have had severe abdominal cramps. I still have had nagging symptoms, like slight nausea, mild headaches, mild sore throat, pain behind my eyes and cheekbones, and fatigue. Muscle cramps all over are lingering. I haven't changed anything in my diet, and I eat greek yogurt as the walk-in-clinic suggested as an accompaniment to the prednisone. My stools are loose and painful and have been for the past week. It almost feels like something inside my colon or rectum is spasming while I'm having a bowel movement.

Do you think my issues are temporary and just need time to resolve? Should I take a probiotic for colon health? Let this run it's course? Is it possible that I have a bacterial infection that will work itself out soon? The pains come and go, it's very odd.
Thank you!