Well, you certainly do exhibit a lot of the symptoms. And your reaction to coffee also fits. It is important to know what is going on because there is a lot that can be done to help you if it is a form of ADHD. It is also pretty common for people with undiagnosed ADHD to start getting frustrated with school work or to be getting depressed or have ever increasing anxiety. If any of that is going on with you, it is even more important to get diagnosed.
I have a lot of information that can help. A really good starting point is the link below. If you have any more questions - just ask. Best wishes.
You may have ADHD, but it is recommended to consult your doctor ! he may or may not recommend you a medicine.