Hiccup! Hiccup!

Well, found another hiccup.
Early in January I experienced some lower abdominal pain. Thinking it was another cyst (as I'm prone to those) I went to the doctor to have it checked out. No cyst. I went on with life figuring that since they had looked at me I would be fine and I could contact someone if it got worse.
Cut to Friday. I'd realized the pain was a bit worse and I experienced some other uncomfortable symptoms. I went to the doctor again.
Now of course the first thing they do at the doctor is take your blood pressure and temperature, and then they weigh you. I jumped up on the scale and then I felt a little faint.
You see, I've always struggled to keep on weight. I really just hated to eat when I was little and though I eat whenever I'm hungry now, I guess sometimes it isn't enough. I remember my mom cheering because I was in the 5th percentile (on the chart! YESSSS!). Anytime I'm in a stressful situation or my time is limited or I'm ill, I drop a few pounds. In college I lost seven pounds the semester I was in pageant. Then I lost them all over again a year and a half later when I had a case of the flu on top of a sinus infection. I never gained them back and have stayed at a very small 92 for about a year.
That day when I stood on the scale, I read 89 lbs. I haven't weighed that in about ten years. Needless to say I had a little conniption. 89 pounds is a BMI of about 17.7 which means I'm officially underweight. Not good. (In research for this blog entry I have read that many doctors say that the BMI is too broad a measure, which I agree to.)
So then I talked to the doctor about all my symptoms and she said I'm...erm...passing a lot of protein. I probably have a UTI and I'm on an antibiotic that makes me dizzy and hot and nauseous.

I know it may seem silly to worry about a loss of three pounds but that's a big deal to me. I'm not always able to guarantee that I can gain it back and I need to be in good shape, especially since the little girl I watch is up to 43 pounds. I've researched a little bit about diet and weight gain and the meal plan I found looked like I would have to increase my food intake by about five times, which I don't think I can do. (BTW guys it's not about packing on the pounds. I have to eat healthy just like anyone else.) It also suggests that I do weight-bearing exercises. Other than rock climbing, I don't like most weight-bearing exercises.
My mother says that we should focus on getting well first and then we will work on the rest of it.

And let me just say this before anyone comments. I know that most people have the opposite problem and think "Oh man I wish I could say that" or something equally belittling. I know that many people struggle to lose weight. But the thing is that underweight people pose many of the same health risks as overweight people. In an absence of body fat, the body goes after muscles for fuel. Because of this, many underweight people are at a risk for heart problems (such as arrhythmia). There's a higher occurrence of brittle bones and osteoporosis. (I'm allergic to milk so I'm already calcium deficient.) One article I read said that underweight people are more prone to anxiety or depression. Less weight means less strength, less fuel, and a diminished ability for a body to keep itself warm. Also, telling an underweight person to "just gain weight" or "just eat more" is like telling an overweight person to just eat less or work out more. So please do not trivialize my problem in light of your own sufferings.
Rant over. I'm really more worried about my health.