Cephalexin Monohydrate and joint pain

I was taking 500mg three times a day. After 1 week I developed severe joint pain and swelling in my fingers. I got an itchy rash on the bridge of my nose and over my eyes and inside my nose. The joint pain continued to my knees and toes. I have been off of the medication 3 weeks and I am just starting to feel a little normal. a different doctor put me on 800 mg of Ibupropen 3 times a day and after reading up on the side effects of Cephalexin I began taking Benadryl which has helped a lot.

I've been taking the medication for three weeks now, 500 mg (I think) twice a day. I've been suffering from a constant gurgling in my stomach, as if from a stomach virus. I'm also experiencing joint pain and some tingling in my fingers and hands, also some pain in toes/feet. Initially I suspected the joint pain could be the onset of arthritis, since it runs in my family. But then I remembered I've been taking this medication for quite a while now; I'm wondering if joint pain could be a side effect?

joint pain, tired, itchy scalp, swelling of joints....I am being treated for cellulitious, on 4xper day (500mg) for over 60 days now, after major antibiotic drips IV for 5 days every 6 hours.....