@victoria93
Yes they were great with help on the first injection.
My BP is 90/60 so I was very worried about that as well. But didn’t experience anything dramatic.
It did go down but only briefly for 10-15 minutes. Some people report it is up to an hour or so. But the numbers reported are the limits of what has been reported. Most (90-95%) I read said don’t have that extreme.

Next the fast HR …yes it is stimulating your Parathyroid so a “fight or flight response” on the sympathetic nervous system …my HR is usually around 55-60 (I was a runner) it went up to 90-95 for about 20-30 minutes then began coming down. Deep breathing helped with that. Relaxing. You can easily increase your heart rate just with the anxiety…I certainly had a boat load of that.
Hydrate for 3 days and everyday. During some electrolytes (not just water …that actually just flushes out your system.
You can drink a glass of water 1/2 before and some after 15-20 minutes or more. This will help with the dizziness or vertigo which I also have major issues with.
Don’t consume calcium 1 1/2 hour before or 4 hours after you injections. That helps prevent or minimize the temporary nausea you might feel a few days in.
All this was just the few weeks till my body adjusts.
For me so far so good.
I hope this helps.