I was nauseous and had fever yesterday, and missed maybe 2 Salahs due to tiredness, also the water was too cold for wudu due to fever, I could’ve pushed myself, I think I could’ve prayed but since it was hard and I didn’t want to due to sickness, tiredness and laziness. What’s the ruling on this?

I was not able to accurately tell what your condition was. However, if you were able to do so, but chose not to because you were tired or lazy or because of your sickness, then you have committed a grave sin. On the other hand, if there was extraordinary hardship or severe sickness that made you unable to perform them, then you are excused. In that case, you simply need to make them up.