Can someone help me?

I’m a major hypochondriac. But anyways, I’ve had tons of mucus for months now, I have terrible allergies. I can’t ever get my mucus out so I have no choice but to swallow, since then I’ve started getting a sore throat just on one side of my throat (where my mucus passes by). I’ve had my sore throat for legit 8 weeks. Some days it’s basically gone and I feel good then it comes back randomly and it hurts again. The doctor tells me it’s allergies and it hurts from post nasal drip. Can it hurt for this long? I’m scared I have throat cancer.