Sudden vomiting after med

Hello, my 83 year old mom has been living with PD for a couple years. A couple weeks ago after taking her evening dose of Carbidopa/Levidopa she would immediately throw up. This continued for a week when we finally admitted her to ER as she was feeling awful. They eventually admitted her to hospital as they found a small clot in lungs (which they say was incidental finding). She continued to get sick in hospital. A huge workup of imaging and tests did not reveal cause of naseaua. Including a gastric emptying study. The only newish med she had added was Wellbutrin but she'd been on that a month without issue. I'm curious if anyone else has experienced this... I'm just wondering if it's the Carbidopa that she's developed intolerance to. Thx!