What the painkillers can do to you depends on the type.

For instance abuse of Ibuprofen (Motrin or Advil) or Asprin (Bayer) can cause stomach problems (it will actually eat a hole in your stomach lining)

Acetamenifen (Tylenol) can damage your liver.

Also these medicines are not chemically addictive (like meth, coke, heroin or other street drugs) If you are "addicted" it is more of a mental thing then anything, subconsciously you feel comfortable when taking these meds or you have associated the taking of these meds with something good and it makes you feel good to take them because of the association.

I would bet (I don't know you so I'm not sure) that you have a mild form of Obsessive Compulsive Disorder. It might be worth a trip to the doctor to see if either you have OCD or if your abuse of the painkillers has caused adverse effects that are causing the stomach pain.

Being addicted or not, taking that many pills can't be good for a person. I think that's why they say the limit on the box. I'm not really sure what the limit is, but I know it's not as high as you say you are taking. My advice... find out why you are taking all these pills. Are you in pain? Are you crying out for attention? Do you just think that moving the focus to the pills you can forget about other bad things that are going on in your life? What is it that is wrong that you are trying to use the pills to cure? Find the route of the problem, and try to figure out another way to deal with it.

If it really is pain, and it takes that many for you to feel alright, then it's time to go to the doctors and get some real pain medication. This way, it won't be harming you to be taking too many at a time like you are now. But if you do go that route, you'll really need to be sure not to take them more than prescribed, because I'm guessing that is a lot more serious of a thing if you are using stronger medicine. You say you are feeling stomach pain. That's probably from all the pills, but seeing a doctor would be the best way to make sure.

If you are having other issues in your life, and the pills seem like a nice distraction from that, then maybe you'll have to confront whatever that problem is. Talk to someone about it... a friend, a family member, even a school councilor or some other type or person that could help you deal with this. There are people and places that can help you, but you have to figure out what your real problem is before you can get help.

If you problem is pain... see a doctor, if your problem is psychological... see a psychologist, if your problem is addiction... see an addiction specialist. Find your problem, and get some help, because you are probably doing yourself more harm than good by taking so many pills.