5w2d - body is TIRED.

I'm feeling like my body is working super hard right now, I'm getting shaky/dizzy/clammy sometimes, I just wonder if I'm giving myself enough fuel to fuel myself and this growing baby. I'm putting baby first and eating but I can only put so much in there, restriction wise. I drink like a fish all the time when I'm not eating. Morning sickness hasn't set in yet, just some slight nausea here and there so I'm keeping everything down, I can only imagine how I'll feel when it does rear it's ugly head. Any suggestions?