Petite Post, Help! 5 feet 98lbs

Ladies, I have always been small, always. I'm not a little person but I also dont weigh much. My usual measurement is 5 feet even and 99-104lbs depending on bloating from my period. I am 9+1 weeks pregnant and am wondering who else is petite (my size petite, cannot even fit into petite sections clothing 😔) and is experiencing lightheaded/faint spells? I, a couple weeks ago, had a situation where I vomited continuously for 43 hours. Lost 6 lbs (last weight check 108.3. Now 102.00).

Am I safe? I've talked to my OB, she recommended a neurologist for 'mini seizures' still waiting on that. Please petite mommies, advice for a scared first timer.