So recently i've been having the feeling that my brain and me are essentially seperate entities and i need to know if this is any kind of mental disorder
Like some good lads advised already you should consult with a doctor and give him/her more details regarding "separate beings".
On the other hand it's not necessarily means you have a mental disorder because brain and consciousness (yourself) are indeed two separate being. For example the brain of a drug addict will do anything to get more drugs, but the addict may find his/her actions questionable.
However we don't know how far they stand with each other in your case. You haven't give us any details.
Strong ale would be cheaper though.
Not in the long run and also bad for the liver and the brain.
And let's not forget about heart and pancreas (especially).