It sounds like you went through the honeymoon phase when you were feeling good. I think that's pretty typical but now that your body has more energy it's probably putting it to good use doing some deep healing.
I can relate to the sleep thing and I was told that's typical in four lows. You feel wired and tired. My practitioner told me to take a little more calcium powder at night if I need it and that seems to help. I've had insomnia off and on since last July. I try to do whatever it takes to get some sleep even if that means medication. It's not a great option,but I really feel that sleep is one of the most important aspects of healing so for me the benefits outweigh the drawbacks.
A retest sounds like a good idea. I find I start feeling impatient and questioning what I'm doing at about the three month mark and then after getting my test it reassures me about what is going on in my body.