morning sickness in 2nd trimester. PLEASE HELP!!

In my 1st trimester I couldn't eat anything. I had absolutely 0 appetite. I'm exactly 16 weeks. When I was 12w2d, I vomited for the first time. And since then, I've vomited maybe 4 other times. Normally I'm fine. But 2 days ago, I vomited everything I ate. I took ondansetron (generic of zofran) that night. I was fine yesterday up until 1-2 hours before bedtime. I knew if I stayed up any longer, I'd throw up. So I took another pill last night, and slept it off. Today I felt fine, up until 30 minutes to an hour ago (around 5-5:30pm) and now I feel like I'm gonna throw up. I'm having a hard time keeping anything down. I've lost 10 lbs since getting pregnant, and I'm still losing weight. I am in between switching doctors, so I can't even ask a doctor for help. I don't know what to do! 😭 I know I'm not eating or drinking enough as it is, but to start losing what little I am eating and drinking?? Please give me some advice. Any advice at all! I've tried crackers, I've tried ginger pills, I've tried tea, and I've tried the prescription my doctor gave me. Nothing is helping, and all I want to do is just go to bed and cry 😭