my fourth pregnancy and it was unplanned...

Hi, I am 26 weeks pregnant and i am so depressed idk whats wrong with me. this is my fourth pregnancy and it was unplanned my oldest child is 18yrs youngest 10 yrs. my husband is tired dealing with me and what i'm goiong through i don't let him touch me or kiss me or hold me. honestly the sound of his voice or even his presence makes me sick. when he's home i stay away from him. he tries so hard to make me happy. I'm on medical leave from work right now because this pregnancy is so hard. when he's at work i miss him and i feel so bad for what i put him threw. and i sit and cry and even send him text messages begging him to forgive me. But when he get's home and i hear his voice i get depressed again.is it because i'm pregnant that i feel like this? Help me! what can i do? and does this phase usually pass as the weeks go by? i'm just so tired of putting him through this.