No STD would give you symptoms within a few hours, and you can't get an STD from a handjob.
In the past, when you've had similar symptoms, can you pinpoint it to anything?
Getting symptoms that soon following any sexual activity is either anxiety or something related to a pre-existing issue (a pre-exisiting infection, something with your prostate, etc). Since you were tested prior to this relationship, and assuming she hasn't gone outside the relationship, assume it's a urinary tract infection or something with your prostate. It doesn't mean cancer - there are a lot of prostate conditions that aren't cancer.
If it lingers, get it checked.
Also, make sure you're drinking lots of water, and ease off the alcohol and caffeine if you drink a lot of either of those. Both are very dehydrating and irritating to the bladder and urethra.
I forgot to mention. I have had symptoms similar to this in the past unrelated to having a hj at a massage place. Have been with same partner for 5 years and this was the only time I've had any sexual contact with anyone other than her during that time period. I was tested for STDs prior to the relationship. All were negative