As said before - helping others helps.
Learning and broadening of your horizon is great but may be somewhat hindered by anxiety - clouded minds have a hard time thinking concisely and effectively.
To clear the mind&body, and heal it to an extent, one can do breathing exercises.
Dr. Hyatt has incredible info("Undoing Yourself", "The Psychopath's Bible", ...) which goes pretty far but the breathing exercises are easy to follow if you're just in for relief. It's an earthbound treatment which means there's no supernatural aspect to it.
There may be also an "unknown" aspect to this in which case the breathing exercises help to draw in /circulate life energy(Chi, Prana, Vril, ...), cleanse and heal. They also strengthen the will and help free one from unwanted entities, thought forms, etc. which can manifest unwanted life circumstances aka illness & Co. Having a special kind of nightmares may indicate that the person is under attack.
If you have to, take some pills. I took antidepressants for years and it was not really good thing. It drew some pretty frightening things in which took a long time to get off.