When I'm on test I get those feelings a lot. It's like I'm just over anxious about things. And then from that stems naseau, loss of appetite, etc. I've also found that reducing any and all thermos, stimulants, etc helps a lot like deoudes said. And I've also noticed for some reason that if I let my body hold more water while on from either aromitization, bloat, etc, the feelings lessen to a considerab;e extent. But when I have to start hitting up the nolva again for gyno symptoms or what have you, they get bad again as I lose more water again.
Thats' one thing that I actually look forward to when coming off....not being so over anxious.