Switching can be tricky there is a January-March option, but it requires certain conditions. https://medicareguide.com/medicare-advantage-to-original-medicare-165588#:~:text=Medicare%20Annual%20Election%20(%E2%80%9CMedicare%20Open,in%20favor%20of%20Original%20Medicare. You might call Medicare.
You could qualify for Tymos assistance https://radiuspharm.com/radius-assist/ But your income has to be pretty low.
Does your Advantage Plan have an out of pocket maximum option?
Mary, I'd switch anyway, even if it isn't until next year.
In your situation, I'd take the three pens and have the medical office press for the approval.
There is the off chance that you wouldn't tolerate the medications. The first pen will tell you.
Taking the medication for three months will leave you a little safer meanwhile.
Lots of people are having to wait for approval for these medications. At least you plan is sending you a little protection, some don't. Because they are sending the first three, I think they will approve the year.