HELP IM DESPERATE

So back story I’m 28 weeks pregnant and have asthma it’s never been bad. But this whole pregnancy I’ve had a hard time with it. I got a nebulizer and inhaler. Used both and no relief. I have to take multiple breaths before I finally get air. I can breath it’s just a process. I have been to ER twice and they did every kind of test even a cat scan and nothing. But I’m borderline panicking over here trying to breath regularly. I’ve been continuously shaking for hours as well. I know nebulizer treatments make you shake but it was happening before and still happening. Now when I take a breath I have this horrible tearing pain in my upper abdomen and I can’t take a big breath cause it hurts my stomach too much. Has this ever happened to anyone else!? What do I do!? I’m not spending another night in ER for nothing but stomach pain is new and I’m going crazy not being able to breath well 😭😡