Of course, I can't be sure that the following applies in your case, but optimising vitamin D levels often helps either anxiety, or depression; check out google.com.au/search?client=opera&q=anxiety%3B+vitamin+D&sourcei d=opera&ie=UTF-8&oe=UTF-8

From: vitamindwiki.com/Handout+on+Vitamin+D+%28Hormone+D%29+and+sleep+-+Gominak+2012 by neurologist Dr. Sasha Gominak about the effect of vitamin D insufficiency on sleep disorders:

"Low D goofs up sleep. Most of the neurological problems my patients have are not directly related to D hormone, they are related to the fact that D hormone deficiency causes sleep disorders; insomnia, sleep apnea, REM related apnea, unexplained awakenings to light sleep, inappropriate body movements during sleep. All of these disorders keep us from healing our bodies during sleep". You may want to read the webpage in full.

VITAMIN D

The govt. RDI of 400 IU daily is long outdated, and based on misinformation, according to Dr. John Cannell, at the VitaminDcouncil. Dr. Weil, Dr. Ben Kim, Dr. Axe, Dr. Gominak, a neurologist, and Dr. Mercola* all agree that an RDI of 5000 IU daily is not excessive, although higher levels may be required as people age, and / or put on weight. My doctor, on the basis of several peer reviewed studies, also agrees that an RDI of 5000 IU daily is not excessive, and it is virtually impossible to get the required amount from dietary sources, without the risk of toxicity.

* VITAMIN D DOSE RECOMMENDATIONS
AGE DOSAGE
"Below 5: 35 units per pound per day
Age 5 - 10: 2500 units
Adults: 5000 units
Pregnant Women: 5000 units
WARNING:
There is no way to know if the above recommendations are correct. The ONLY way to know is to test your blood. You might need 4-5 times the amount recommended above. Ideally your blood level of 25 OH D should be 60ng/ml".

The NOAEL (No observed adverse effect level) specified by the Institute of Medicine is 10,000 IU/day. Around 1 person in 300 is allergic to it, so start out with only 1,000 IU on the first day, if supplementing.

Dr. Gominak now recommends optimising vitamin D levels in the range 60 ng/ml to 80 ng/ml, and Dr. Mercola recommended 60 ng/ml or 150 nmol/litre, which is now my target level.

Vitamin D is not a true vitamin, but a hormonal substrate that is vitally important for the activation of almost 3,000 genes in the body. Its main cofactors are: zinc, magnesium, vitamin K2, and boron.

Google: "How To Make Sure That You Are Getting Enough Vitamin D; Dr. Ben Kim", then: "My 1 hr free lecture on vitamin D; Dr. Mercola".

Note that most doctors would regard as acceptable lower levels of vitamin D than those recommended by Dr. John Cannell of the vitamin D council, or Professor Michael Holick, a former member, and an expert in vitamin D.

Read: "Why are doctors reluctant to accept vitamin D", at:
vitamindwiki.com/Why+are+doctors+reluctant+to+accept+vitamin+D and in particular:
"Would you be opposed to my getting more vitamin D", at:
vitamindwiki.com/tiki-index.php?page_id=3162

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* REPROGRAMMING:
Use the Technique for Reprogramming Negative Thoughts: It's important to regularly monitor, and deal with a negative internal monologue (self talk), or mental process, such as disturbing thoughts, images, impulses, or emotions, by the process of (a): recognising it, and (b): challenging it immediately. Technique For Re-Programming Negative Thoughts: When you notice something negative, such as: "I can't do this/ am never going to get over this!" or: "Why am I always so useless/such a loser?" or even an image, emotion, or a memory; recognise that it is being generated from the negative part of your mind.

After identifying and labelling it, visualise a large, red, flashing, "STOP!" sign, and/or possibly a stern faced person wagging an index finger at you in a negative manner, then say to yourself as forcefully as you can, even aloud in a big voice, if alone: "I know this tactic: GO AWAY FOR A WHILE !!!" You may want to use either: "ruse", "ploy", "game", or "trick". In the case of an image, visualise a large "STOP" sign, or your preferred version.

Some people go so far as to keep a wide rubber band in their pocket, then put it around their wrist, when they catch themselves backsliding, stretch and release it, as a method of reprogramming their mind sooner, but I don't regard it as being strictly necessary. Remember to remove it, afterwards, if you use this method. Try replacing a negative thought with a positive affirmation of your choice, like: "I am a unique individual, with my own set of skills, and good points", or "I may not be perfect, but I'm doing the best I can, right now".

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From personal experience, I can tell you that it takes some considerable time to recover from habitual cannabis use, even partially. Stick with it, though, and you will eventually come good.