Ok, so let me get this straight - you are cruising now, at the beginning of your prep right? With intention to add more compounds later so you are giving your body a rest now, right?
If so, that's exactly what I'm doing too. I blast and cruise, and cruising now as I ease into my contest diet. Calories are still very high so I'm good with 250mg's of Test E once a week. 4 more weeks and I'll add other compounds.
Anyway, that being said - yeah, you'll feel "smaller" even when on Test now but only because you were probably on a lot more before. It's funny how we adapt. A typical first cycle with 250mg's makes the beginner feel like a god, but then after years of use 250mg's is like being natty..LOL. So that's probably why you feel deflated. Also, your diet is probably different (cleaner) so your body is adjusting.
As for feeling sick, hormonal shifts can effect your immune system. I don't know why and I'm not going to make up some bro-science but it's true. Give it some time or if you are really worried go get some bloodwork.
I get blood work pre, during and post blast and during cruise. Blood, liver, kidney and estrogen:test ratio is what I get checked.
Good luck. And say PLEASE next time....lol.