Why am I sick again

I had an absolutely miserable first trimester, with constant nausea and indigestion. Then around week 11 it was like a miracle: I was full of energy, I was happy, I felt great all day, and baby was healthy and strong. Now, I'm 13 weeks, and suddenly the sickness has returned. I can't eat. I have terrible heartburn. I can't poop. I can't sleep because I feel so sick at night.

Why is my baby tormenting me?? Is this normal? Will I get better again? And why do none of the recommended "cures" work for me?! Everything seems to make it worse! Being pregnant is crazy.