Low blood sugar-

Okay so last week I had a terrible episode at work where I became light headed and clammy, covered in sweat with blurry vision and felt like I was going to pass out. I called my Ob and got a return call from the nurse. After telling her all I had eaten that morning was a pop tart and some milk she told me to get something else in my system, preferably protein. A few hours later the same thing happened, though not as severe. Went in for my normal check appointment the following day and they drew some blood work. Got my results back today, ( they checked my liver, urine and did blood work, worried about preclampsia). Everything came back normal except my blood sugar was at a 64 and protein in my urine. Now I am being told I need to eat every 2-3 hours something high in protein and drink more water. Has anyone else struggled with this? I've been trying to eat more frequently/stay hydrated but always feel so full, I feel sick!