The link should direct you to patient help. If your income is low enough, even if you own property or goods, you may qualifly for the $80 pen. In that case you wouldn't use your medicare D plan.
Tymlos increases the cells that build bone. But it can't remodel bone with too many of the cells that resorb bone. Prolia releases a mass of those cells (osteoclasts) when you stop taking Prolia.
It isn't the Tymlos that makes Prolia dangerous when you stop. When you stop the only drug thought capable of handling the mass of osteoclasts is Reclast. It is the absence of a follow up antiresorptive drug that makes your rheumatologist worry about rebound.
If you don't have osteonecrosis you might continue Prolia. If you continue Prolia, Tymlos plus Prolia would increase your bone mineral density more than Prolia alone.
Prolia can be good, if you can stay on it. Another commentor has a femur fracture from Prolia on one side and a deeply weakened femur on the other side. None of the doctors have an answer for this dilemma. I'm adding my prayers that you don't have osteonecrosis. And that you can get off Prolia with two years of Reclast, so that you can get safely on Tymlos
wishing you luck