Seriously concerned.

Mareike
For the last two weeks I have had a huge decrease in appetite. Actually I've had no appetite at all. I have to force myself to eat. And when I do eat, I feel sick afterwards. Like so nauseous I could literally throw up if I let myself. The idea of food makes me sick. Things I use to love taste horrible now! 
 I've also had a decrease in thirst, but a constant need to go pee- yet nothing comes out because I barely drink anything.
I've been working on drinking more water. (Which I used to love) but for the last two weeks it's like I'd rather not eat or drink at all, until my mouth is so dry that I have to drink water to help with that. 
I'm on the implanon so I don't believe that my loss of appetite and urge to go pee can be from being pregnant. 
Should I go see my doctor about this? Is there any advice anyone Can give me on what could be going on?