GERD & Heartburn Support Group
Gastroesophageal Reflux Disease (GERD) is defined as chronic symptoms or mucosal damage produced by the abnormal reflux of gastric contents into the esophagus. This is commonly due to transient or permanent changes in the barrier between the esophagus and the stomach. If you are afflicted with GERD or heartburn, join the group and find support.

Arm, Check and breast pain doesn't sound like the normal symptoms, you should probably go in and see your Dr.
Prilosec doesn't cause the symptoms you've mentioned.
So, neither of you mentioned which meds you were on for the Anxiety, so I checked a couple of the usual.
They do have muscle aches, side pain, stomach pain as "possible side effects"
Another thing to think about, sometimes if your stomach is just not happy and your reflux is bad, you can get gas build up that gets under your ribs and moves up towards your chest, and it hurts like hell, it can feel like your having a heart attack.
So if it happens again, maybe take a gas pill and see if that helps, also put a heating pad over your rib cage/under your breast.
Sorry if this is more info. than you wanted, I've deal with GERD and all this crap for 20+ years.