Depression? Pregnant maybe? Stress? I got some issues.

PLEASE READ! Iv been stressed to the max. My boyfriend is in the military and I’m so scared of getting cheated on. I always question him on his loyalty and try to catch him in a lie which makes us argue and fight. I get stressed out to where I don’t want to eat and I haven’t been eating like I usually do. I eat fast food all the time to where I don’t want fast food anymore so I just don’t eat at all. Iv watched my weight for the past month go down from 100 to 88. Last night I threw up what tasted like acid. I couldn’t see because I was knocking on a door and the porch light was on (not enough light to see) my appetite for food is lost. I don’t want to eat anything and nothing sounds good. I feel tired all the time but can never take a nap in the afternoons. I’m always cooped up in the house. Most of the time I don’t want to go anywhere or do anything. My boyfriend did come inside of me once while he was here 2 weeks ago but Iv been taking my birth control like I’m supposed to and haven’t missed a pill (although my period came but it was very light. Not like my normal period) This morning I weighed 90.. how I gained 2 lbs from yesterday and today is unknown because I didn’t even eat dinner last night and ate very little yesterday during the day. I think I had a chicken strip, yogurt, a cookie, a bagel, cereal, & kids meal from whataburger but I ate nothing after 6 last night ( & that’s what the scale says in my bathroom) my mom thinks I’m depressed. She takes depression medicine and so does my grandma. I think I need to take a trip to the doctor and explain to him what’s going on and maybe find a solution to this. Thoughts opinions? HELP. I’m also 19 and watch my nephew during the day time. I don’t have a real job and yes I’m graduated.

Not sure what category to put this in either