Is it okay to take my morning medications before esophageal manometry?

Depends. it depends of the medications most likely not.
Depends. It it advisable not to have anything on the stomach prior to any rsophageal studies but if meds are critcal to not miss it is best to consult the physician doing the test a soperhaps he can do early enough so you can still take you routine meds after the procedure. Either way it is best to consult the physcian performing the procedure to get his requirements.