Help for nausea. Desperate

I’m undergoing chemotherapy and the nausea is just so severe I can’t keep food down, drink or get out of bed. I’ve tried 12mg Zofran, phenergan, Ativan, emend, compazine, ginger, and Benadryl. I’ve tried them overlapping as well and no relief. It’s so severe and had been going on for so long I’m considering stoping treatment. I just can’t handle it anymore. It’s been months of this, and I still have months to go and each cycle get more and more intense.