Relief for morning sickness

Hello fellow mommies! I'm a first-time mommy and will be 8 weeks tomorrow. My severe nausea started at 6 weeks and absolutely nothing that was prescribed to me worked (ondestron, diclegis, B6, wrist bands, BRAT diet, Unisom)-now, my doctor is prescribing me Promethazine. Has anyone ever used this before and did it work for you? I know everyone is different, but I'm getting desperate for relief as I'm struggling at work to keep up when feeling so sick. I feel guilty for being so miserable as my husband and I have tried for a baby since 2008 and are finally blessed. Can anyone else relate??