He might be going back to his mother as he migt feel safe there, (linking back to childhood) he needs his mother to feel safe.
You shoud take him to he doctors, to see if he is suffering with depression or a disorder.
I really do hope for the bes. And good luck.
The "phobia" part is the suffix. The adjectival form replaces the final 'a' with 'c': '~phobic'.
'
A sufferer from a phobia is a '~phobe'; so in our example, a 'claustrophobe'.
Claustrophobia is the fear of small spaces or being locked into a small space without an escape route.
A person who is scared of tight places is a 'claustrophobe' (n.).
You are asking for the opposite of claustrophobia which people mistakenly think is agoraphobia which translates, "fear of the marketplace" but it really means that the person is afraid of having a panic attack or being trapped in an embarrassing situation without any escape. I don't believe there is an actual word to describe what the opposite of claustrophobia is. (I googled it and came up with chasmophila which supposedly ment the love of small places but ended up being a fake word)
Answer
Fear of confined spaces.
An easy way to remember this is to associate the word "closet" with "Claustrophobia.
A bomb shelter.
This could be claustrophobia or it can also be anxiety. If you know you are not claustrophobic then most likely it is anxiety.
It's complicated. Part of the brain can cause fear, the adrenal gland (a rush that doesn't stop like in a normal person) and some medications. Phobias are usually fear of crowded places, flying, heights, repetitive behavior (like closing and opening the door twice before your leave your home or car.) Some people are terrified of spiders (I am) rodents, snakes, etc. Some of these are common fears and I do believe sometimes we can be thrown back into primal instincts of survival modes. Fear of spiders or bugs of any sort is no big deal, but conquering flying if you know you have to fly is a must and there are therapists that can help. Fear of heights (unless you are in a job where you are required to work from heights) is another thing that isn't all that big a deal. Anything that controls your life and takes the quality away IS a big deal. Cognitive Behavior Therapy by a therapist are great tools to help you cope with anxiety, stress, Agoraphobia, out-bursts of anger, anti-social behavior or the lack of confidence.
fear of being inclosed in a small area
costraphobic is a fear of inclosed spaces or even dark inclosed spaceshttp://www.answers.com/tats%20claustrophobic%20...but%20claustrophobic%20may%20be%20the%20fear%20of%20high%20prices!!actually%20there%20is%20no%20such%20name...but%20may%20be%20in%20de%20future%20it%20can%20be!!!