Re: I think I'm feeling burnout or worse. I am seriously considering walking away.
sounds like burn out.
I don't personally know you situation, so I can't tell you to leave or not man. But Aikido is about love. If you don't love it, don't do it. Everyone gets burn out every now and again, especially if they train a lot.
If you have a zeal to return after your burn out it might be because you honestly love Aikido... if not; well, don't do anything you don't honestly love.