@shien
Firstly, and most importantly, and I can't emphasise this strongly enough - There is absolutely nothing "abnormal" with you.
I suspect that quite the opposite is true. Bear in mind I'm no expert!
You are a young woman in the prime of her childbearing years. My guess is that your body is telling you that it's time to procreate, and that is resulting in your high sex drive. I don't think a GP will be able to give you anything, as what's happening is possibly hormonal.
Think about why you married him - you obviously care for him, but -
Do you love him? Can you see a future with him? Can you see yourself having children with him? (Does he want children?) If the answer is no, then maybe leaving him is the right thing to do.
However, how long might it take you to find someone that wants the same things as you do?
I'm not going to condone anything untoward, but you could consider discussing things like an open marriage / partner swapping / swinging - at least that way you might get some sexual relief without ruining your existing relationship.