When evening came, many who were demon-possessed were brought to him, and he drove out the spirits with a word and healed all the sick. This was to fulfill what was spoken through the prophet Isaiah: "He took up our infirmities and carried our diseases." (Matthew 8:16, 17)
Jesus, was and is still the healer and deliverer. He has not changed. When sick, we can still pray and seek a healing from him. Of course, there are many who do not believe in this simple fact anymore, but we must trust in God's Word rather than in men's opinion. There are others who opine that the following verses from Isaiah 53 speaks only about spiritual sickness and healing and not bodily healing.
Surely he took up our infirmities and carried our sorrows, yet we considered him stricken by God, smitten by him, and afflicted. But he was pierced for our transgressions, he was crushed for our iniquities; the punishment that brought us peace was upon him, and by his wounds we are healed. (Isaiah 53:4, 5)
The gospel writer Matthew allays all such doubts by writing that the bodily healings and deliverances that Jesus effected was the fulfillment of what Isaiah prophesied long back, even though redemption from sins and eternal death was the main aspect.
We can still believe and see the glory of God as Jesus heals our sicknesses and delivers us from satanic attacks which manifest as bodily ailments or mental troubles.