OMG! How many years have you been dealing with this. Have you developed Barrett's yet? You should have your GI order an esophogram/barium swallow to check the extent of reflux and sliding of the stomach. Your GI or a surgeon specializing in the LINX procedure can also order an esophogeal motility study which tests the effectiveness of your swallowing. If your swallowing is fine then have the LINX done . It will stop the reflux . The hole in your diaghragm will be repaired at the same time so your stomach won't slide any longer.
I just had this done myself on Jan 22nd. My surgeon also undid a Nissan fundalplication from 24yrs ago that had slipped down my stomach making it look like an hour Glass. The LINX band of magnetic beads around the LES/ Lower esophageal sphincter has stopped all reflux and I'm heartburn free for the first time in over 24yrs.