I had nasal spray to unblock my nose and now when I'm clearing my throat it has blood in the saliva what can I do apart from go to the doctor?

Nosebleed. Likely source of blood is your nose (post-nasal drip). Be careful with medications that can over-dry the fragile tissues in your nose. See your doc if the bleeding is heavy or continues for more than a couple of days.
Saline spray. A saline spray can help irrigate the nasal passages and wash away clotted blood. If the spray he is using is a steroid nasal spray, it is a common side effect and should resolve on its own in a couple of days. If the problem continues, go to the doctor. He can resume using the prescription nasal spray once his bleeding stops.