I'm not sure if this would be helpful or not, but could you at least have a smoothie? There are so many different options out there for smoothies.
I once broke up with my boyfriend (my husband now) and I was so devastated that I completely lost my appetite. I tried to eat but just couldn't. These days, I joke with him that he should pretend to leave me so that I could get that back!
I know it's not a funny experience though because we need food to survive and thrive.
I do think you should talk to the doctor who Rx the Wellbutrin. Even though you're not "wasting away," your body is not getting proper nutrition which is not healthy.
I'm sure you'll figure this out soon.