Someone drugged me making me sedated, change of speech and mentality still don't feel right 4 days later will i go back to normal? heavy head sleepy

You need examination: It is necessary to be examined and have yourself tested for potentially toxic substances etc. Depending upon what is found in your bloodstream in a situation such as this there may be a way to expedite metabolism of the drug out of your system but that's entirely dependent upon knowing what was used which will likely be difficult. Hopefully, you've already reported this to the authorities as well?