Hi all, I'm looking for some answers. I have a 15 year old son who is constantly sick for about a year and a half but almost constantly for the past year. He is now depressed and anxious and on Prozac since August which has helped with his depression. But he continues to be sick all the time. He also sleeps very poorly since about 3 years. He has gone through various tests, including gastric tests to determine why he vomits so frequently. All the tests came back fine. Can his immune system be suppressed due to depression? Is the lack of sleep the cause? What can I do to improve his immune system? He takes vitamin D, E, fish oil, and probiotics. I am so worried this will never end.