May well be that your body is getting used to lower levels.. Despite some being over 10 still.
I would write down another week of readings, exercise, times of not feeling good etc and then take to your HCP to discuss.
Trouble is your body doesnt necessaily kick back to feeling good again immediately that you take insulin. However, it doesn't necessarily mesn that you should feel worse!!!
If you really feel awful, give your HCP a telephone call.. They may be able to offer help over the phone.