... of feeling down and confusion and my concentration is poor and make stupid mistakes at work.my GO has upped my dose from 20 to 40 I'm finding that still a week before and during my period I'm not feeling any better also feel that I get brain fog this makes it hard for me to get things right and bad memory.I'm now beginning to feel at my wits end as my bosses are getting fed up and telling me it needs to be resolved .please help.I'm also having to take 100mg Levothyroxine as I have an interactive thyroid.