Docs are switching me from toprol (metoprolol) XL 12.5 to propranolol ER 60mgs and I'm worried my BP and pulse will drop to low? Mission is to help w anxiety.

Probably Fine. If you are basically healthy (no heart or lung problems) this should be fine, however I am a bit curious about the choice of treatment. Have you had a diagnostic evaluation of your anxiety? Beta blockers help with the physical symptoms of anxiety but may not help the cognitive (worried thoughts) symptoms.