Fexofenadine 180mg symptoms and conditions

I have been taking the generic for Allegra (180mg), Fexofenadine 180mg, for about 2 years -- ever since I moved to middle-Virginia. I thought I had a cold that would not go away. The doctor put me on Allegra, and it did help, yet didn't stop, the horrible runny nose, watery eyes, etc. Around that same time, I started having horrible leg/feet cramps at night...so bad that my sleep is constantly interrupted with having to jump out of bed multiple times to walk off the cramp. My doctor prescribed Requip and, even on the strongest dose, the cramps would not go away. A pharmacist suggested I try Highlands Leg Cramp pills (w/quinine) and that helped reduce the severity and number of leg/feet cramps for a while. Now the cramping is back, full-strength, and I just began a desperate research of side effects for all the medications I am taking. Lo, and behold, I just read that others who are taking Allegra are experiencing this same symptom. Unfortunately I took my morning dose this a.m., but I will begin tomorrow not taking Allegra and hopefully that is all it takes to end these leg cramps. And, oh yes, I too have regular stomach cramps and diarrhea and have lost 20 lbs. without dieting. I'm now wondering if Allegra is also responsible for all of these unexplained "other things" going on with my body. I hope I won't be bombarded with bad side effects by going off the Allegra "cold turkey." However, anything is better than the leg cramping!