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I had gone through your question and I can understand your concern.
As per your history, it looks that you are having reversible pulpitis, that means there is a cavity in progression. If you will get it filled, sensitivity will go and there will be no further decay. If you left it as it may lead to your infection, then you have to get it root canaled or extracted. You can use desensitizing toothpaste but this is temporary. You can also avoid it by not taking hot or cold or sweet food but all these are temporary provision. My opinion is to visit a dentist and get it filled as soon as possible.