As I don't know the content of your speech or who you are addressing it's a little difficult to be precise... Perhaps one of these might help...
Recite your speech to a favorite song when practicing
Change your speech into poetry form; rhythm is great for remembering
Use a prop; write your speech or main phrases and place it pre speech on the podium
When you recite your speech look straight ahead just over the level of your audiences heads; concentrate on the same spot, when your almost finished; and it's a good idea to have a phrase that finishes all your speeches address your audience with sweeping eye contact and expressionate hand movements
Join a debate club; great for practicing your public speaking
O.K Nuwi lastly... never ever get embarrassed... you're the one that knows the speech no one else... take your time and breath evenly... pause every now and then...
Good luck; hope this might help!