Hello Jess and welcome,
I have a long history of trying meds until I would find combos that were close but along with the meds I have a therapist and this support group.
I use Inderal for the very symptoms you have been prescribed Atenolol - to keep your heart rate and BP under control.
I hope you take the time to read some of great threads and that you will see we all struggle at times and we all experience the good times too.