As already staded
See a professional (Start with your doctor. It could be symptoms of mental illness.
It cold also be symptoms of something somatic (physical) that is just manifesting in a strange way.
The Dr's can figure that out way better than us random folks online.
If he / she thinks you need other areas of expertise they will send you to someone else)
Read the bible and pray. Know that while there are demons, and they can interfere with us, Christ and the holy spirit are strong than any demon , yet keep in mind, not everything in life is demon - related.
Fear not
Yes some of these verses are in a context spoken to specific people in specific situation, but the Lord we serve is the same God these people served!
Isaiah 41:10
Fear thou not; for I am with thee: be not dismayed; for I am thy God: I will strengthen thee; yea, I will help thee; yea, I will uphold thee with the right hand of my righteousness.
Isiaiah 35:4 Say to them that are of a fearful heart, Be strong, fear not: behold, your God will come with vengeance, even God with a recompence; he will come and save you.
Isiaiah 41:13 For I the Lord thy God will hold thy right hand, saying unto thee, Fear not; I will help thee.
Luke 8:50 But when Jesus heard it, he answered him, saying, Fear not: believe only, and she shall be made whole.
Luke 12:7 But even the very hairs of your head are all numbered. Fear not therefore: ye are of more value than many sparrows.
Romans 8:15 For ye have not received the spirit of bondage again to fear; but ye have received the Spirit of adoption, whereby we cry, Abba, Father.
2 Tim 1:7 For God hath not given us the spirit of fear; but of power, and of love, and of a sound mind.
1 John 4: 18 There is no fear in love; but perfect love casteth out fear: because fear hath torment. He that feareth is not made perfect in love.
Revelation 1: 17 And when I saw him, I fell at his feet as dead. And he laid his right hand upon me, saying unto me, Fear not; I am the first and the last: