I Got Suspended And Want To Know If I Have A Case.

A little background. I'm pregnant (first trimester) with type one diabetes.... (diabetes non gestational). I'm a chef at a big company in las vegas, Nevada.
Well one day I had a massive headache. I thought it will go away. I went to work and the headache stuck. I drank caffeine. Ate food. And even made sure it wasn't my Diabetes. Well I decided to sit in my office and put my head down for 20 minutes.
Well later on I got a message asking if I had fallen asleep from my big boss. I told her I wasn't feeling well and I'm pregnant and it was only for 20 minutes. I ended up getting suspended. I didn't sign the paper work. I refused to sign.. I didn't even read the paper. When I got home I realized that there was nothing on this suspension besides "possible policy violations"
When I went in for the investigation interview they asked me "do you know why you got suspended?" I responded "because I put my head down for 20 minutes to rest" never once was I corrected (big thing to remember). They asked me questions and took my statement and that was it. I asked for a copy of the notes taken. They Even had a picture of me. They told me I couldn't have them.
Thursday they called me in the morning and asked me for a note stating that the reason I fell asleep was due to a medical reason. I called my doctor and they had it to me by the end of the day. I sent it in. The next day I was called by the HR manager asking for a meeting. I said asked what for if I already had a meeting. She just kept saying to speak with her.
When I went into the meeting she claimed I got suspended for "taking a break in an unauthorized area" again I was in my office. She stated it's in the hand book. I looked over the policies and procedures I cannot find anything Stating anything about "proper authorized areas for breaks" nor did I see in the performance standards anything about "unauthorized break areas" but I did see the "appearance of sleeping on the job.
They let me come back after five days but did not back pay me. Even after I got all documents they asked for. Even the very specific doctors note.
After coming back they told me that there was statements written about that incident. And that they "tried" to shake me awake. In which I instantly called BS. Because my thoughts were if I was unresponsive why didn't they call medical? Instead of telling my supervisor? But anyhow,
Any advice? Could I have a case?
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