Bad stomach in pregnancy

Hi ladies, I am 15 weeks and not doing so good. I’ve been on various Nausea medicines bc I can’t keep food downs I haven’t had total success on any medicine. Yesterday I called my doctor because I was dizzy and throwing up almost. He suggested I see a nutritionist as he feels I may not be eating right. Idk how that’s possible bc at this point I eat whatever i possibly can for the baby. Today I woke up feeling slightly better. I ended to having some

Fruit for breakfast and now I have these constant pains in my stomach which feel like gas or maybe it’s from constipation bc of course I’ve had that too! The longer I’m pregnant the worse I’m getting! I was fine during my first pregnancy. I’m not sure what to do. Has anyone experienced this ever? I just want to feel better! I meet with the nutritionist tomorrow. Not sure if that will help but I’m truly desperate at this point.

Thank you!