It could be symptoms of low blood sugar. Forgetfulness, can't concentrate,
'zoning' or mind goes blank, feeling not so good after 3-4 hrs not eating and feeling better once you've eaten, usually a period of 10 minutes to an hour after youve eaten the blood sugar spikes and a person can get quite giddy, silly and/or unable to control laughter.
Low blood sugar runs with low cortisol. This is quite common in most people now adays and once you are pregnant you can become even lower on cortisol.
a 24 hour saliva cortisol test (NOT the A.M. blood test) can pinpoint low cortisol very easily and painlessly. If your doctor wont give you one, you can order it yourself on canaryclub.org. for about 100 bucks. It is worth checking- because low cortisol (in you) during pregnany means low cortisol in your infant. Infants born with low cortisol can have a variety of syndromes:
breathing difficulties/asthma/croup, Low weight, failure to thrive, feeding difficulties, GERD, blood sugar deregulation, SIDS, and sleeping issues, just for starters.