Help please?

I'll be 11 weeks this week with my first. 
And all of the sudden everything has changed, I cry over EVERYTHING. And I've became extremely attached to certain things & people... I'm becoming depressed and I'm scared I'm harming my baby with all of the stress... I don't want them leaving my sight... Also I have no appetite? Up untill now I've ate a lot!!!! Now I have to force food down my throat... 
Does any one have any tips or suggestions?