Greetings to France! Sorry to hear about the anxiety you have experienced on cycle. I can't help but wonder if you tend to feel some level of anxiety naturally? Steroids tend to magnify feelings, good or bad. Guys that tend to be hot tempered, are usually the guys who give steroids a bad name, blowing up and blaming it on "roid rage". The same tends to be true with anxiety. Androgens do stimulate the central nervous system. CNS stimulation can lead to an increased sense of tension or anxiety. This is especially true with higher doses or stronger, more androgenic compounds. EQ is also known to create anxiety in some guys. I've never heard of Deca causing this, but I'm not shocked either. My suggestion to you, would be to stay away from the stronger drugs, like tren and halo. Something on the milder side, such as Anavar may be better suited to your concerns. It can help with strength, which will lead to gains, coupled with the right diet, and it also doesn't make you hold water, so it is great for cutting too. If you want to bulk, add it to the first 6-8 wks of a test cycle and if you are interested in cutting, use it in the last 6-8 wks of your cycle. If you find that you start to feel uncomfortable, it has a short half life, You can always reduce the dose and feel relief within a day or two