I just started my 3rd trimester

Hey Glow nuture fam. Im 24 and ive had a fairly boring easy pregnancy according to my ob. Ive had the normal symptoms. But never really had morning sickness. Im 27wks currently and ive had new symtoms such as insomnia, severe fatigue, and no matter how much i eat or what time i do im always hungry. My body has this nerve condition from being on a stimulant for 12 years as a kid. But it feels like my tremors are in over drive even if i do eat. Not to mention today at work i got this painful searing pain on my left side where my lungs and heart are and it didnt go away for a good 30 min. (Tht turned out to be gas) my appt is coming up soon but im worried about me passing out again bc of the nerve metabolism thing. Its happened before but now im worried as a soon to be mom. If u guys also have any tips on how to sleep better so im not tossing and turning 75% of the weeknights. And also there are times at night where my legs have muscle spasms. Im a first time expectant mom and im terrified now after having a good first two trimesters.