G01 said:
Before you decide to go back to grad school, even if in a different field, you need to figure out what your problem with grad school is
I would say it has a lot to do with not liking the university; it's too big and I feel I don't have anything in common with the other grad students. I have begun associating with people with different interests, too, such as philosophy, history, and classics instead of physics.
G01 said:
and if it will follow you into a different discipline.
Why do you keep dropping out? Do you not like your chosen field of study or is it the atmosphere of grad school in general (the long hours, isolation, obsessive nature of everyone around)?
Yes, the isolation is annoying. The only time I see my fellow grad students is during class, and classroom atmospheres are very "contrived."
G01 said:
Though the subject matter may change, graduate school is graduate school.
Yes, this is true. I do well if I am passionate about something. The question is finding what exactly that may be. I knew this would happen to me even as an undergrad freshman. Back then I was focused, determined, and passionate about physics, math, astronomy, research, and even foreign languages. Now I am struggling to reinvigorate my interest in something
specific.
Pyrrhus said:
I agree with Vanadium. I am not trying to be discouraging, but you have a problem.
Indeed

I wish more people would tell me that. It is actually encouraging to me. Their tacitness is actually more de-motivating.
Pyrrhus said:
You need to figure out why do you think you should do a PhD
Or even just a master's...
Pyrrhus said:
, and why is that reason NOT good enough for you to actually finish the degree. This is very important or else you'll keep dropping out, and this is not fair to you, and your prospective advisors.
Yes thank you for the advice. That's another problem: I didn't follow my advisor's advice as an undergrad and ended up going into a MS program I didn't like (too engineering-oriented), but it was a last resort. I didn't want to go back to the physics department here because it was worse, and this was after having been rejected from all 10 of the grad schools elsewhere to which I applied (thus, yes, even from my ~3, supposedly easy backups). But my interest had been waning since even before then anyways.