[2Co 5:6, 17 KJV] 6 Therefore [we are] always confident, knowing that, whilst we are at home in the body, we are absent from the Lord: ... 17 Therefore if any man [be] in Christ, [he is] a new creature: old things are passed away; behold, all things are become new.
[Rom 12:2 KJV] 2 And be not conformed to this world: but be ye transformed by the renewing of your mind, that ye may prove what [is] that good, and acceptable, and perfect, will of God.
Icky-ness - (For Lack Of A Better Word)
When we feel unwarranted dark thoughts, or even general "icky-ness" firstly, ask God if He is trying to show you something. We
may need to confess and repent of a sin or something. Or maybe, God is warning us about something. Of course reading God's Word and praying, always as important as sleeping and nutrition. Even more so actually.
If nothing changes and it isn't passing or even worsening, always ask those you trust to pray for you and focus on God's Truth. Seek Him always, icky or not.
Always remember, the spiritual battle 24/7, a war that rages on in the heavenly realms.
[Mat 6:25-27 KJV] 25 Therefore I say unto you, Take no thought for your life, what ye shall eat, or what ye shall drink; nor yet for your body, what ye shall put on. Is not the life more than meat, and the body than raiment? 26 Behold the fowls of the air: for they sow not, neither do they reap, nor gather into barns; yet your heavenly Father feedeth them. Are ye not much better than they? 27 Which of you by taking thought can add one cubit unto his stature?