This pregnancy has been hard.

I loved my first pregnancy, I didn't have any real problems and the time just flew by but I'm pregnant now with my second. I'm 23 weeks along and it has been hard on me. The first trimester went by fine, so morning sickness but nothing major but it seemed like as soon as I entered the second trimester it has gotten harder on me. Most days I can't keep anything down and the medicine that my doctor gave me for throwing up doesn't help any. And some days I can't even walk 2 blocks slowly without my stomach getting hard and hurting me where the baby is. I am so tired most days that all I want to do is sleep. I don't know what to do and am currently waiting to hear back from my doctor. Has anyone else felt like this?? What happened with you??