I had severe HB from 30 weeks and my midwife gave me prescriptions for Gaviscon on a weekly basis so i didn't have to pay for it.
She also suggested no chocolate, hot chocoliate, tea, coffee or milk before bed as these all trigger HB. Nothing hot n spicy and if necessary sleep in a semi sitting position to help.
Personally i don't think anything other than actually giving birth relieves HB totally so you may have to live with it - but the above could help reduce the severity.
Cara