It will pass, I had exactly the same feeling about 6 months into owning mine, the gears started to crunch, the clutch got heavy and started to hurt my left knee in traffic.... again it wasn't cheap as I needed a new clutch & flywheel but once I got those I was over the moon again
If spending 2k on the car is making you fall out of love how is spending considerably more on a 370z going to help
Once you get back behind the wheel properly you will fall back in love with the car I am sure, I know I did
For me my Zed isn't about what wheels I have, what body kit or how blingy my engine bay looks it's about how I feel when I am driving it, that's why I have spent so much time and money on my I.C.E. and my interior because I spend far more time driving it than I do detailing it and taking pictures