I noticed that you mentioned taking Reglan. I would avoid that. Very constipating.
You can also try some type of oil at bedtime. Mineral, olive. I do 1 tbsp. Not as bad as you would think. Pretty much tasteless.
Smooth Move Tea will also do it for me. How long you let it steep determines how strong it will be. I’m pretty resistant and it works for me in a matter of hours. If I’m really backed up, I’ll drink a cup of warm prune juice with a pat of melted butter first. Gag! But, between those two things I can almost guarantee, you will definitely have relief soon!