A319 Flight Attendant crew reported a fumes event during cruise which initially subsided and resumed during descent. At destination Maintenance serviced the aircraft and flight attendants were treated for physiological symptoms.

Narrative

I Flight Attendant #2 (FA) was on the back of serving cart; when FA #4 asked me if I felt the engine aircraft left humming harder than usual and if I smelled a sweet smell like rum. Yes; I did notice. #4 went forward to communicate this info. I began to check the overheads and area. I noticed the area of smell covered forward and rows 8-14. When FA #4 came back some passengers complained to her about the smell and humming noise. We had XXX passengers on board. The smell subsided. We monitored. We had a different chemical smell appear on descent in front and back galleys and in cockpit. We had the ZZZ [Airport] Firemen check our blood pressure and oxygen levels. We all had some effects from the fumes. My blood pressure was 132/82 which is usually 120/80. I had a metal taste and a little croup. The flight was delayed until XA:00 the next morning. Three maintenance guys worked all night on the aircraft. We flew the same aircraft with a new captain. On landing both galleys; and cockpit had slight chemical smell reoccur. I followed up with the nurse after the trip ended.