Tapering from Ativan prescribed for gastroparesis

I was put on Ativan for nausea and stomach cramps for my Gastroparesis. I am allergic to all the antinausea meds they normally give and they use Ativan with cancer patients. I am on 1mg at night to sleep, .5mg mid day and .5mg evening. I just had to add the mid day .5 because of interdosage withdrawal. I have been o.n this for 8 months. I'm afraid to start tapering because of my Gastroparesis symptoms. Anyone else have this issue?