Hi, Blue Sky, I think you should seriously consider having the flu jag. I've never had flu, thankfully, listening to other Gnetters, but I developed serious pleurisy years ago after receiving radioactive iodine treatment for overactive thyroid. My thyroid became profoundly underactive and my immune system collapsed. It took me months and three antibiotics to recover, so if flu is anything like pleurisy I seriously want to avoid it.
I am still doing supply teaching since I retired so I can go to the school office and get a voucher to take to Lloyds Pharmacy for free flu injection. My grandchildren get the nasal flu vaccine at school also, peace of mind.
Best wishes.