Flora29, could you contact the RSPCA re your FIL's poorly cat? If the animal is only mildly ill, they could perhaps treat it and then find it a home when it has recovered. It would be a great shame to put puss down because your family can no longer keep it. Did your FIL ever take it to a local vet for vaccinations, etc.? If he did, perhaps they could help. My own vet has a policy of never putting down a healthy animal. A fundamentally healthy one which needs treatment is, when recovered from their treatment, sent to a cat shelter or found a home by them. Or, the PDSA might be able to treat puss without charging you anything.
Sorry, can't help with your FIL!
I'm on zoladex and letrozole, so slightly different. However, the letrozole did cause nausea in the beginning, so I take it in the evening and that worked. The anxiety can be from the drug too. If it doesn't settle down, speak to your oncologist again and see what they recommend. I've not heard that it puts you into early menopause?