In the last month I have noticed an almost complete loss of appetite so much so that somedays I simply forget to eat, until like right before bed it dawns on me that I haven't eaten anything yet today, I know I have been taking in less than 500 calories a day since early to mid April and I've lost 12 pounds without even effort or thought, I know it's not healthy to not eat all day but I'm forgetting more often when I get busy I don't even think about food but I am drinking a lot of tea/soda/water/juice while at my desk

I'm not under or overweight, should I be worried? Or just go with it? Maybe I'm just busy and stressed from the new job? I have noticed when I wake up some mornings I feel shaky but when I try to eat a little something even toast I feel sick and become nauseous, it's almost similar to motion sickness

I'm not knocked up or anything but I seem to have a real problem eating, when I go out at lunch for work I do order an entree but pick at it, and send it back unfinished it's like nothing looks or tastes good to me now but I'm getting an increasing amount of headaches

can anyone relate? is this a stage?

I also went off the zoloft during this time so I'm wondering if that is factor

just be glad you have the easy way to get skinny and go to the doctor meanwhile. it could not be anything, it could be due to the stress. When I'm very upset I barely eat for days, or when I have a cold...
still force yourself to eat something though.

Well I do know that Zoloft withdrawal can cause nausea and also dizziness. ALong with tremors, lightheadedness, muscle pains, weakness, insomnia, and anxiety. It lasts usually 1-2 weeks sometimes as long as a month but after that should be gone.

The fluids you are intaking may be keeping you feeling full.

The only time I have loss of appetite is when it's really hot, or if I've over drank water or something.

If you don't get your appetite back soon I'd suggest seeking your doctor about it.