3rd trimester morning sickness and depression?

I just started my 3rd trimester and these last few weeks, I feel like I'm constantly sick unless I'm eating...not long after I stop eating the sickness is back. Now the last couple of days I have felt a really heavy depression, like what is the point? Baby seems fine. She is moving and growing. I dont remember the last time I felt this way...I dont want to tell my husband. He is so amazing! He works a full time job on the weekends and cares for our 2 yr old son during the week so I can sleep during the day and work nights. I really hope this is normal and that it will just pass.