I think my son hates me

I'm at my wits end I don't know what to do... My son is 9 months and cries constantly all day and wakes up every hour at night... When my husband is at home he just seems like a completely different child which is awesome except he works 12hr shifts so he's only here for about an hour before bedtime.. My son was a good baby hardly ever cried slept all night and just seemed content until he turned 5 months... He might take a 30 min nap during the day but he wakes up screaming... I'm exhausted mentally and physically... I need some sleep!!! I can't nap when he does because I have a 2yr and even if he decides to sleep a little late I still have to wake up early to get my 3 older boys up for school!!! oh and I'm 22 weeks pregnant with yet another boy... I hope things get better before baby arrives if not I don't think I can handle it...