If you are concerned sweetums you should see a doctor.
Anyone that I have heard having withdrawal symptoms gets them nearly immediately and they seem to peak around day 4 and pretty much finish in the first week - although the brain fog can continue for some time.
I'm not a doctor, this is solely based on what I have heard/read. I also read the what can happen when withdrawing thread after I had been sober a few days and it freaked me out. I did go to a doctor around that time and it put my mind at ease.