How am I supposed to be calm when I wait for the doctor for my hard belly?

Last month I noticed that my bottom belly on the left side is hard when I lay down. I poke at it and it’s solid hard. I don’t understand. I thought it’s because I’m bloating and starting my period. I’m getting concerned and I’m supposed to see a doctor January 5th. Honestly I am so terrified if I get stomach cancer, kidney cancer or all that shit. I wish they had a sooner appointment. I don’t understand how my belly got very hard. I work out, I don’t always eat right, I take iron pills but been lacking taking it everyday. I don’t understand why is my body going though this. My left side of my back hurts but not too bad. I know I’m staring my period soon. I tried heating pads and my belly didn’t softened. Why won’t my belly soften? Has any of you felt with this before? I asked for an earlier appointment but they have the 5th one that’s the only available opening.

if I have cancer I’m done for. I’m scare that it might burst while I sleep. I don’t wanna die.

How am I supposed to be calm when I wait for the doctor for my hard belly?
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