What besides throat cancer cause sore throat, some pain, sometimes problems swallowing for longer than 3 months? I don't think I had temperature during that period ether.

Well first a sore throat can be caused by so many things its impossible to name them all and keep the answer fairly short. As for swallowing difficulties, there are a few things besides cancer that can cause this and they can be grouped into two categories Neurological i.e: Stroke, Parkinsons, Multiple Sclerosis, or Muscular i.e: Muscular Distrophy, Myasthenia Gravis. The best thing is to see your doctor so s/he can order the appropriate tests, like a Modified Barium Swallow eval.