Last night I had to urinate every couple minutes for 3-4 hours. There was some pain and a little bit of blood when I wiped. Now today I seem to be better without the frequency. Do you think I have a bladder infection and need an antibiotic?

Without the frequency, but still with discomfort ? I would get it checked out if I were you. Possible UTIs should not be ignored. You don't want it going into your kidneys.