lhankins,
have you considered Forteo. Tymlos is four times as much medication as Forteo and Forteo has a lesser impact on calcium levels.
A few small studies indicate that Prolia is usually safe for 5 to 7 years. You may have a good experience with Prolia and may be able to take it for life without fracturing. The statistical risk of atypical femur fracture and osteonecrosis are quite low. Flu-like symptoms after infusion are more common. The often unreported, devastating effects are usually in the elderly.
Damage for the relatively few is so extreme that I hold a negative opinion of the medication.
It may be (sounds as if) the rheumatologist is uncomfortable requesting a slower infusion from the nursing staff.
Dilution of the medication for a slower infusion protects your kidney's in addition to making your response to the medication more comfortable. "Other problems," I mark with a question mark the way you have. If you increase the hydration and don't increase the time of infusion that would cause other problems.
I'd prefer that you'd have a lower dose of Reclast initially with a longer infusion.
You might ask the physician if they can refer you to a different infusion center. You might call the infusion center and ask if they could accomodate a longer infusion and then recontact the physician.
We need better choices. I hope your choice brings you the best luck.