Unbalanced

Jackie
I am at 8w3d postpartum and just last night I felt a switch in my body. Something changed drastically and I felt it. After my son was born I felt the happiest but yesterday, last night something negative, a flu like sickness came over me. I don't know if it's depression, mood swing, I just don't know. Since last night, I have had my son near me the whole time (I have to have him right there)! Psychologically, can it be a mixture of anxiety and separation anxiety? 
I have practiced meditation and self control over the last 4 years and I can tell you maybe it is all in the mind. But what is it with me? I want to fix it but fix what? 
Does anyone else feel this way? 
Is it just me that can't explain this sensation? I don't know what to call it.