Hi Mistyice I feel for you it's so scary isn't it, although I'm not quite 80 I'm just starting similar treatment due to secondary in bones, had total hip replacement in September and now taking letrazole once day,  denosumab injection once monthly and abermaciclib twice daily which I think is quite similar to pacocilib, all good except in morning latter causes nausea my oncology team say these treatments are very good long term and have very good outcome so I do hope it works for you aswell, this last few months have been very hard and scariest times for most in our situation and I can only hope it will get better for us, stay strong and positive, have you been given a rapid response number if so ring them with any problems you may experience they are so helpful and also your oncology team will put your mind at rest don't be thinking you will be a nuisance to them because they know the worries you face, I don't know what area you live but maybe we will be in same waiting area at some point so look around and smile if I smile at you we all know what you are going through xx god bless a speedy and manageable recovery x