HELP?! CAN'T EAT?!

I am 22 and a law student, and have a boyfriend.

We never had unprotected sex yet, we are getting tested first. Some of his semen might have went too close, but I don't think anything too major. I tested last week and it was negative just to rule it out. I also don't get periods because I'm on Nexplanon.

I went from 30mg to 40mg of Citalopram for depression about 6 weeks ago. Everything was good. I am just tired all of the time, like I could sleep all day and night if possible.

I used to eat tons. I am 5ft and 98 pounds and I don't really gain too much, but I usually eat at least 5 huge meals a day and always am snacking.

Now I have 0 appetite and am Extremely nausous all of the time. This has just started 2 weeks ago. I can go a full 24 hours without food and not mind. Before, I couldn't go 24 minutes without food.

Food nauseates me and makes me want to throw up and I only am craving soft pretzels and spaghetti and pickles. But even when I am craving them, I have to force myself to eat and gag.

I really do not have money to get to the doctor right now. Do I need to...? I have no idea what is going on..