But what if i’m just in the hospital and praying to God. God doesn’t intervene for whatever reason. Could Satan intervene even if i’m not even considering him and i’m praying to God but he doesn’t see fit to answer at that moment?
The only reason a fallen angel (be it Satan or someone else, there are a lot) would interfere with someone’s body is to draw him towards eternal damnation.
In fact, it would be especially proper of the work of the adversary to step in when God, in His fatherly love and wisdom, is not granting us exactly what we are asking for (though God
always answers our prayers with a superabundance of graces). However, if you are not well and praying to the Lord for health and you start feeling better, that’s hardly the work of an enemy, since you feel grateful towards God
Mind you, I think it is quite rare that the fallen angels can interfere so openly with out body. Temptations are a different matter. Regardless of whether they are from an enemy or from our fallen nature, temptations (be it through motions of the souls, feelings, etc.) always leave us exhalted above measure, proud, and away from the Lord. Motions from the Lord usually fill us of love and thanksgiving, and make us feel humble - even full of joy, but humble.
As others have mentioned, the work of the creature known as Satan hits a wall when it approaches man. True, the ancient enemy did gain some level of authority over human beings due to Original Sin, but the victory of Christ, the sanctifying grace we receive in Baptism and that is restored, when lost, through the Sacrament of Reconciliation, is such that we are delivered from the spiritual slavery of sin and we can say with the Apostle: “I no longer live, but Christ lives in me” - the same Christ who said once: “here comes the prince of this world. He has no power over me.” Keep that in mind if you are ever worried about the fallen angels, for the state of grace is an unbreakable shield around your soul, the shield of the Holy Spirit. As my own rule of thumb, I always despise and ignore the thought of the adversary. I don’t deny him or his work - as many unfortunately do - but I don’t focus on him either. Am I being tempted? I don’t get angry at Satan, I call to Christ for help and offer Him through Our Lady everything I am feeling. Am I frightened? I do not think of the presence of Satan, but of the presence of that guardian angel who has been by my side even before I was born, and who sees the face of God.
For ultimately there are many creatures, all created good, some of which bear good fruits, other bad fruits, but they are finite and imperfect…yet,
in God we live, and move, and have our being, and as He said to the prophet Isaiah:
this is what the high and lofty One says–he who lives forever, whose name is holy:
“I live in a high and holy place,
but also with him who is contrite and lowly in spirit,
to revive the spirit of the lowly
and to revive the heart of the contrite.”
May Our Lady cover you with her mantle, just as she covered her divine child during times of cold wind and rain.