Dear friend, welcome to HCM !
along lower ribs and upper abdomen with nausea
could be Herpes
Can you upload a photo of the rash here on the webpage using the uploader on your right)?
Is the pain excruciating and electric like or more of dull ache?
I would advise to see your ER/ physician for the condition as early treatment would greatly help.
Also an examination in person to consider other differentials if the rash is not classic.
Take care and please keep me informed of your progress.
Good Luck !
I hope to have answered your query satisfactorily.
May I request for your rating and review of this answer before you accept the answer and close the query (if there are no more follow up questions)?
Thank you !