Hate this feeling

I'm not sure if it is normal or something to bring up to my doctor again, but i feel shakey once in a while (like jittery like i have gad too much coffee but i have had no caffeine what so ever) and i cant figure out what triggers it. I will say i feel hungry all the time and have been snacking a lot and trying to eat not sure if that is some of the cause. It comes and goes. Anyone else experiencing the severe hunger coupled with shakey/jittery feeling?