The blood test isn't as reliable as doing a swab of your vagina or a urine sample to test for chlamydia, so it's hard to say if your friend had it, or if you did.
You took the correct treatment, so there's not any reason to suspect you've had it all this time.
However, since you are having symptoms, you should see your doctor. You could have it again from a different partner, or have something like a UTI, an ovarian cyst, or quite a few other things. Ask to be tested for chlamydia (and other STDs) to be sure you don't still have it, or haven't gotten it again.
Let us know what happens.