Just a quick note -  this unfortunate lad seems to be under a lot of internal pressure. Everything I've come to expect to see in a chart relating to anxiety seems to be here in some form. I'm glad you've been there for him to open up to and offer some guidance. When I see friends suffer from bad bouts of anxiety it honestly seems the worst kind of hell to be in.

 

Sometimes I see anxiety as a side effect of having an enormous amount of mental energy so it's not surprising that I always see Gemini represented (and to a lesser extent Virgo) in people with anxiety. His sun is in Gemini with Mercury very stressed in that tight T-square with even more mental energy added by tight conj with Mars. Neptune and the Moon into that mix show how his emotional state is affected and with Neptune so close to the Asc coupled with the planets in his 12th house his worries/fears aren't necessarily rational but they are deep rooted.

 

Capricorn Asc makes Saturn the chart ruler which is opposing his sun from the 12th house, this house placement of Saturn can make a person very fearful and fretful and  makes him prone to depression too, which often links with anxiety through lack of Serotonin.

Venus doesn't seem to have any real positive aspects, perhaps there isn't much in life that gives him pleasure outside of the home (4th house).

 

8th house Moon - morbid thoughts, worries about death and sex?

 

Mars-Neptune opp across 1st-7th House - persecution complex. 

 

They say that any mental health problems tend to show in men around their early 20s, (he is 20), I guess that's why it's starting to become a real concern for him now but it isn't something likely to blow over quickly. If he seeks counselling or Cognitive Behaviour Therapy while he is still young and the anxiety hasn't had the chance to set into a rut for him it will help to alleviate the symptoms for him.