I'm Tired All The Time. I Can't Sleep More Than

I'm tired all the time. I can't sleep more than 4 hours at a time, have no energy, find it difficult to concentrate on work, and have bouts of vomiting. I'm on Blood Pressure Meds and have been for months, as well as lexipro (my husband was diagnosed with cancer back in Sept). I'm finding it difficult to accomplish anything, but I have to be the one to accomplish everything, because my husband is debilitated. i'm wondering if I need a different doctor, cause there's definitely something wrong with me. I'm normally a high-performance type person.