[trcollinson]

> "alternating with short bouts of motivation"

I think you might have pinned it here. It may be that you are just fine as a developer but that you have burn out or some other mental health issue honestly. I don't mean that as a negative. I was burned out very badly a few years back and I felt exactly like you describe. It led to anxiety, depression, a lack of motivation, pain... nearly a mental breakdown.

I had been on a bit of anxiety medication for a while. I had a near breakdown (some would say a total breakdown). My doctor literally said "You need to go see a therapist. I mean it. You can either go on your own or I am locking you into the trunk of my car and taking you and you won't be let out until you talk to someone." (So, my doctor threatened to kidnap me, and thank goodness!) So I went and talk to a therapist. And talked. And talked so more. For months, then years. It has changed my life for the better. I am a better developer. I work better. I am a better husband and father. I FEEL better.

I really can't recommend highly enough that you take a look into your mental health. It will help a lot. So what now? Talk to a professional.