Hi Mary,
Just speed reading what's happening with Bonnie, so many apologies if I've missed a post. Glad she's eaten something...
A blood pressure check is vital! This MUST be done on a basis of taking her in, letting her settle down, and doing it and no other treatment/bloods or messing with her beforehand, and this WILL affect her blood pressure reading. I have nursed with a LOT of poor vets, so it's imperative you find a good vet. Agatha was hyperthyroid and hypertensive, and after a few weeks getting the balance right on Istin (and hyper-T treatment), she was absolutely fine. I see quite a few high blood pressure cats coming through which we check, and detached retinas are fairly common in older cats, but can be rectified if treatment is sought as soon as possible. I would urge you to find a good cat vet for future visits with Bonnie... or ask for a referral. You are so obviously prepared to care for her the best you can, so a good vet is one to hang on to! All vets are good/interested in different things, I know the vet I use is amazing with our cats and rabbits, so I always use her, but for the dogs I use a different vet, because he is particularly fab with canines!
Got everything crossed Bonnie improves quickly, and sending a big hug your way...
Liz