I suffered from severe nausea for up to 18 weeks, vomiting almost ever…

I suffered from severe nausea for up to 18 weeks, vomiting almost every time after eating. I could only eat spaghetti without salt or spices. Then I started having terrible lower back pain, I couldn't sit, walk, or even turn over. Now it's starting to compress organs and constrict my diaphragm, making it very difficult and painful to breathe. It's hard to walk, and I feel nauseous if I stand for longer than two hours. But at the same time, I think my pregnancy is going perfectly fine. Probably hormones of happiness are doing their thing. ??