Generalized motility disorder

I recently got diagnosed with generalized motility disorder.My reflux is controlled by Omeprazole.I also have moderate gastroparesis and constipation and rectocele.For 5 weeks Motegrity was working well for the constipation,until I developed rectal pressure almost daily and constipation is worse.The GI doctor ordered anorectal manometry and MR defecography,pelvic floor therapy and to take Miralax everyday which seems to work well so far.It sucks having this problem and having my birthday tomorrow.Has anybody had these tests and taking Miralax long term? I am a nurse and going back to work soon,it is so hard to help others if you cannot help yourself.I am hoping for some improvment and a better quality of life.It is so hard that I cannot eat any of the food that I culturally grew up with due to this gastroparesis.