What to do if i got really drunk and still don't feel good, on the forth day?

See your health care: provider. Hangovers can last several days, and 4 days is not unusual, particularly if it was a very heavy drinking episode. In this case, an ounce of prevention is worth MORE than a pound of cure, and you need to sharply reduce your intake of alcohol. You may have caused some pancreatic or liver inflammation, and that may be why you still don't feel well. If you need help cutting down, talk to MD