Bactrim DS and adverse reactions

UNTIL READING DIFFERENT REACTIONS TO BACTRIM, I THOUGHT THAT I MAY POSSIBLY HAVE A BRAIN TUMOR. I STARTED BACTRIM FOR POSSIBLE STAPH INFECTION AFTER HAVING POISON IVY AND SOME SPIDER BITES. AFTER TWO DAYS ON BACTRIM, I DEVELOPED A LOW FEVER AND HAD DIFFICULTY SLEEPING ALSO HEADACHE. I STOPPED TAKING IT ABOUT HALFWAY THROUGH MY PRESCRIPTION AND DEVELOPED DOUBLE VISION FOR THE NEXT SIX DAYS OFF AND ON. THE WORST TWO DAYS FOR ABOUT FOUR HOURS STRAIGHT. I SAW A OPHTHALMOLOGIST WHO COULD FIND NOTHING WRONG WITH MY EYES AND SUGGESTED THAT MANY THINGS COULD CAUSE IT FROM MEDS TO A BRAIN TUMOR. I FEEL BETTER AFTER READING OTHER ADVERSE REACTIONS. I ALSO DEVELOPED HIVES ON BOTH THIGHS. NASTY MED.