Thank you for the response.
I am always 105 and always tired, but not quite this tired. My mouth is no longer sore, but it was for at least 2 weeks. I am now in the third week and just starting to feel a difference. An infection sounds about right. Hmmm, thanks for the info. I know I need to put on weight. I have a VERY fast metabolism, but also a very poor diet and I think that coupled with the need to have a soft diet just depleted anything that my body was using as energy. Thanks again.
Is your mouth sore? Maybe you're fighting off an infection in there? If you think it's anything like that, I'd go to the doctor - maybe ask for an antibiotic or something.
Try making sure you're getting enough carbs and also enough fat. If there aren't enough carbs in your soup, you'll get fatigued pretty easily - especially being so underweight.
Are you always 105 lbs, or just because of losing weight because of the week of soup? That's really underweight for 5'7. As for a long term outlook, putting on a good 10 lbs or so would not only be healthier for your body, but would probably make a difference energy wise as well.