As someone who has suffered major issues with anxiety for half my life, I understand how your co-worker is feeling. I'm no longer as anxious as I was in the past thanks to the right meds and being a little more confident.

Anyways, keep this to yourself. Don't tell anyone about his issues. Be there for him when he needs you. I agree with what was written above. Don't hold in all your frustrations for his benefit. If you do, you'll probably start to feel resentful. Perhaps you can kindly tell him that seeking therapy might help him with his issues.

Be sure to also say that you'll always be there for him and give him your email and number in case you haven't done that already so that he won't think that you're trying to get rid of him by asking him to see a therapist. Ask him if he ever took meds before for this.

If not, encourage him to take some psychiatric meds for anxiety. I'm currently on paxil and valium. Tell him to stay away from valium though as most Drs. no longer prescribe it since it's hard to get off. Make sure that you say that at a time when he's not anxious. Us anxious people tend to worry too much as it is.