Rumer Willis has an "unknown stomach problem" which has left her sick for "almost an entire month". The 30-year-old actress has said she's been feeling under the weather for the majority of August thanks to a mysterious illness which makes her feel as though her "stomach is on fire". In a lengthy Instagram post on Thursday (15.08.19), the 'How Do We Let Go?' actress wrote: "This was me yesterday. Exhausted ...