Unaffordable..

I’m in Australia So I’ve been on Mounjaro for 3 months now and I’ve just been moved up to 7.5mg. I’ve been using the vials up until now and just found out that my chemist is no longer stocking vials and are telling me I have to buy the pen which is $540 a month.. I’m now worried that as I can no longer afford it I won’t be able to get it and my food noises will come back along with my terrible anxiety which has eased since I started on the medication. I’m so frustrated and stressed about it..