Hi Tara,
When cyclosporine was working for me, I was at 5.5 mg/kg/day. Currently, I am at a dosage that is below therapeutic levels ( 2 mg/kg/day), and my platelets are just slowly decreasing.
Your dosage does seem a little on the high level at 7 mg/kg/day. I know some doctors like to start at a high level to build up the cyclosporine level in your blood.
You could always have the discussion with your doctor about lowering your dosage to 300 mg/day for a few weeks just to see if it makes a difference in your nausea level. I use to have these discussion/trials all the time when I was at higher dosages
I think following up with a GI doctor is wise advice. I know it is overwhelming to have another yet doctor's appointments and procedure, but I am recently learning that there can be some GI conditions that cause hematologic disorders as well as some hematologic conditions/treatments that may cause autoimmune GI disorders. An endoscopy/biopsy is a quick, relatively painless, procedure that can give you insight into other potential causes of your nausea.
Hope they can find the cause!