With the pandemic resolution especially from the second wave, many people are suffering from post-COVID symptoms. People need to identify their diseases at an early stage to prevent or save their life. The proposed system designs an automated system that can predict the disease based on the symptoms passed by the people. Since the symptoms-based disease dataset contains categorical data previous researchers utilized boosting algorithms “CatBoost” (Categorical Boosting) because they require lesser resources but their performance in terms of accuracy is "79.4"%. The proposed model blends the ensemble boosting algorithm with the traditional naive Bayesian algorithm to improve the support and accuracy of the model. Blending a pure ensemble algorithm is raising the problem of overfitting, so it blends the combination of non-linear models with the ensemble algorithm. One of the blending layers is implemented as XGBOOST because it assigns the weights to the symptoms based on the disease because every symptom will not have the same impact on all the diseases. During the process of blending, the decision of XGBOOST plays an important role. The proposed model's accuracy of "97.2%" is significantly higher than the single-boost strategy.