As well a diet suggestions for the long term
Lots of fluid.
Longer than ususal walks. Walking, if you can, helps a lot.
You need a mixture of softening laxatives and make you go laxatives
The standard "make you go" laxative is Dulcolax, or Senna tablets. If needed as a one off occasionally use more than the general dosage, I do, it's OK.
Movicol is a softening laxative, expensive but one of the tops, as lactulose is. I take extra Movicol if stuck as well as the make you go.
(I'm on tablets that make me constantly constipated without help)
An enema will de bung you. You can buy on Amazon and self administer or someone else. (Squirt up bum near a toilet if you can reach the relevant bit to do yourself.)
My personal advice is try large dose lactulose or movicol asap combined with a "make you go" and.... stay home.