Hi Perin -
Sorry to hear you having some pain these days. Unfortunately, I am not too familiar with the meds you have been prescribed. I think I have heard of Fosomax - is that for osteoporosis, too? Actually, it's funny you mentioned the Viactiv chews. I just purchased them yesterday! My Dr. said it was important to get extra calcium and the calcium supplements don't always absorb enough in your system. He said unless I can drink 4 glasses of milk per day (I don't think so!) then the chews would be a good alternative.
Sorry I couldn't be of more help. Have you tried doing internet searches for these drugs? Keep in mind, a lot of the side effects listed are sometimes rare or "worst case scenario." I've had concerns about different meds as well. But, then I realized that by law they have to list EVERY possible side effect anyone has ever experienced - even if it was just a few people! So, try to weigh out the potential for side effects vs. how the medication will help you. Also, it's good to ask your Dr. how many of his/her patients react or have sider effects to the meds.
Best of Luck!