Lacerated toe. infected, swollen, red, radiating pain. now, urge to urinate often and rectal discharge/itching. coincidence or infection spreading?

Sounds awful: That sounds like a nasty toe laceration, and if infected it should be looked at by a primary care or urgent care Dr. who will see if it needs to be drained or consider antibiotics. A spreading infection can lead to fever, chills, spreading redness, fatigue then may lead to diarrhea, but what you're describing without the other symptoms I've mentioned is unlikely to be from a toe infection.