[rcirka]

How is your diet and exercise? Cut out any sugar and caffeine, avoid high processed foods (especially white bread and soda) and try to exercise at least 30 minutes daily. Do you take vitamin supplements? It is possible you could be vitamin deficient. There are blood test for that. Vitamin B-3 (niacin), vitamin C and vitamin D-3 are especially important.

Assuming those basis are covered, how is your breathing/posture? Programmers especially can develop bad posture because of sitting all day. Make sure you don't slouch when you sit. Here is something to try - when you feel anxiety coming, immediately stand still, straighten your back, slow down your breathing taking normal size breaths (don't deep breath, just breath normally) and clear your mind for 30 seconds.

How is your sleep, do you snore loudly and don't feel rested? You might want to check if you have sleep apnea.

That's all I can think of for now. There are also drugs, both non-prescription and prescription that can help. Personally I'd only use them as a last resort.