The Zpack has been linked to some heart issues -- you might want to explore that. Also, is it contraindicated with the Atenolol? I am on Norpace and cannot take any antibiotic that ends in "mycin." (I believe Zpack is Erythomycin). There was a post on here of a woman who took Norpace and an antibiotic and ended up in ICU. I can't remember if she had continuing problems or not. I would definitely run this past your doctor and maybe your pharmacist. Good luck.
I agree that you should see your doctor. When dizziness, an off-balance feeling, and nausea occur, one always has to look at something called Meniere's Disease, an ear condition that you can Google.
There are other things also, but this deserves an appointment.
what type of blood pressure machine are you using? have you had it checked for accuracy?
Have you mentioned your symptoms to your doctor? A number of things could cause your symptoms and seeing a dr who can run appropriate tests would be a good starting point. I dont see anything too worrisome w/ your BP measurement. What is your BP like when you see the "sparkles"?
I should also add that drinking even the littlest bit of caffeine and standard housework type stuff causes my symptoms to worsen. Basically anything that elevates my heart rate causes me to feel unwell and extremely fatigued.