Wondering if it’s normal

Hi mummies, I am at week 5 and my morning sickness is getting worst. I don’t actually vomit but just gag reflex, I feel so weak and useless. I’m a first timer mommy to be and I keep telling my husband ‘I can’t do it' because the morning sickness and nausea is bad enough. I don’t know what else to do anymore. I feel so useless and weak. I have no appetite and i can’t drink plain water. Cause I can’t handle it.