Aware of my heartbeat. Couldn't sleep last night felt jittery and anxious, still do. Have acid reflux burning throat chest last night too. Related?

Maybe. These are some real physical symptoms that may be brought on due to your body's reaction to anxiety. Your Dr can give Rx's for the GERD and might also offer Rx for anxiety - I'd urge you to also add some CBT therapy to optimize the meds and learn ways to avoid, reduce and manage it. It'll make years of better living possible!