The symptoms you are experiencing can be directly associated with an infection, for which the bactrim
But,another important question here would to know about whether or not you have used bactrim before? As your presentation got worse after administration of bactrim, we cannstill suspect an allergic reaction
Usually you should experience a response to medication (if the correct medication is prescribed) within 24-48 hours. If you do not experience this improvement, then please revisit your doctor for an elaborate evaluation and change in prescription.
Hope this helps.