Decent bras for painful breasts

Two weeks before my period, my breasts are agony. I've started on starflower oil to help get rid of the pain (GP advised Evening Primrose oil for the GLA but the starflower oil had more GLA). What I would like is some advice on what kind of bra I should be looking at to jog in. I have just started exercising and am walking mainly with the odd attempt at running short sections but having tried it today...OMG! Had to clamp an arm across them to stop them moving! I basically need something to strap them to my chest and prevent any movement for those two weeks of exercise.

Any ideas/help? I'm on benefits so can't afford anything too expensive.