Some times pain caused by slipped disc
can also radiate to abdomen with relief after sleeping, lying down you may need to see a spine specialist or get an spine MRI to rule out the same.
If you have had diverticulitis
in past worth while getting an CT scan
of abdomen to rule out acute diverticulitis. It is unlikely if there is no fever, or vomiting
Hope this answers your query.
Please do reply in case of any further questions.
Wish you a speedy recovery.