Can anyone with medical or neurological training help me figure this out?

Anonymous
I told my doctor about this and he basically did a blood test and moved on. ... So...
Ok, this sounds weird as h*ll, but this has actually been a huge problem for me for years.
My personality and sense of taste keep changing drastically over night, to the point where I've had to completely change my diet multiple times and I'm probably going to also have to change university/college programs.
Example: I used to eat meat regularly, and over night, I can't stomach even the sight of any meat at all. Same with onions, chocolate, mint, etc., where I ate it and realized the taste was revolting. But it happens the other way too. I HATED avocado, and then one morning I just randomly liked it.
Personality: Had to switch out of a law program because I went from passionate and knowing that was all I cared about to being bored and wanting nothing to do with it. I decided to go to school to be a paramedic instead, and now all of a sudden (again, over night) my personality did a 180 and now I'm totally upset by small illnesses or injuries when huge ones never phased me... The same goes for friends and "not friends", where I'll ADORE someone one day and then all of a sudden I'll never want to see them again (and that feeling so far hasn't changed for anyone I've felt that way about).
Do you see why this is a problem? :P I don't know what to do about this at all. It makes me nuts because I don't know how I'll feel the next morning when I wake up or where I'll be or WANT to be in a month...
Can anyone with medical or neurological training help me figure this out?
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