I am afraid that I might have cancer....

Ive been having these strange symptoms and I really cant explain them...

1) Hoarseness in the morning...Can feel think Mucus...Goes away by itself

2) Mysterious Pimple like spots in the back of my mouth...Also disappear by themselves

3) Sometimes I feel irritation in my throat

Throat and oral cancer, as well as Leukemia have symptoms similar to this...

Can anyone please advise me?

You didn't include your age. Most likely it is not cancer, those symptoms are too non specific to point towards cancer. You could go to an ENT if the problem persists. A dentist could probably rule out most oral cancers, except esophagus, throat etc. Mention these problems to your doctor at the next visit.