Why can't I seem to lose weight anymore?

Anonymous
I'm eating healthy, drinking water every day, taking Judo classes 3x a week and hang out with my boyfriend on Saturdays.

I can't seem to lose weight no matter what. I went from 132-135 all the way to 143-145. I'm told that's ok for 5'7 but still. I think this is too much. I gained weight in only a few days way back in late Dec and it's not going down.

Note: I'm ok in bloodcount, there is no cancer, my liver is ok, my heart is ok, my blood sugar is good, I don't have high blood pressure (it's actually always below 120/80) so what's the issue?
Updates
+1 y
The only thing I can think about is I'm stressed out over my long-end job, going nowhere and a couple other signs I'm worried about:
Along the sudden, unexplained weight gain I'm finding myself sometimes sweating at night (even though it's cold and everyone in the house aren't having that issue), earlier period and irritated lately.
Why can't I seem to lose weight anymore?
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