For what it's worth, I think a 7 month old is just about the hardest age of kid to have. They are old enough to scream and complain but young enough to not be able to fix any of their problems themselves. Hang in there, and good luck ;-)
(And don't let "teach them sign language" think you need to teach full on words. Basic signaling that is agreed between you and them is all I mean. Typically "want" and "hungry" are the only ones you need.)