NEED SERIOUS ADVICE please!! What is my problem??

Hello I am having a serious problem ever since I was small but it has progressively gotten worse. The symptoms are as follows: 1. When I was about 14 years old I first noticed that I had to read things over and over just to be able to grasp them. This is especially bad the more technical the writing is. For... show more Hello I am having a serious problem ever since I was small but it has progressively gotten worse. The symptoms are as follows:

1. When I was about 14 years old I first noticed that I had to read things over and over just to be able to grasp them. This is especially bad the more technical the writing is. For instance, history and science are very difficult for me. Anything that explains details rather than just simple facts is very difficult for me to read. The following articles are very difficult for me:

1. http://en.wikipedia.org/wiki/peptidoglyc...

2. http://en.wikipedia.org/wiki/immunoglobu...

3. http://en.wikipedia.org/wiki/lateral_mal...

I felt sleepy and exhausted after two paragraphs from each article above. My brain turned into mishmash and I couldn't absorb any more information. I also tire very easily when jogging for more than 20 seconds or having to do any task at all, physical or mental, for more than a few minutes. Even reading novels that I like is so difficult.
Update: Someone said I might have ADD. I got tested for it when I was 26. Result was negative. The doctor gave me tests and put me on adderol. All it did was speed up my heart rate. After 3 days of taking it, she told me to discontinue it because it should have worked immediately. To people who think that I may be out... show more Someone said I might have ADD. I got tested for it when I was 26. Result was negative. The doctor gave me tests and put me on adderol. All it did was speed up my heart rate. After 3 days of taking it, she told me to discontinue it because it should have worked immediately.


To people who think that I may be out of shape, that isn't the case I think. I just seem to not have any motivation after a few times I do a task. This applies to any task, even those that I feel really excited about before starting them. Then I'll find I get bogged down and tired/bored. I'm starting medical school in a few days so I'm really worried about this problem of not being able to assimilate information. Is it a question of solely intelligence then??
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